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P Atomic Orbital vs. SP3 Hybrid Orbitals P Atomic Orbitals vs. Sp3 Hybrid Orbitals P-Block Elements vs. S P Value vs. Z Test P vs. Sony Tablet S P21 vs. P53 P53 vs. TP53 PA12 vs. Viton PA6 vs. PA66 PaaS vs. SaaS Pace vs. Speed Pachyderm vs. Shin Pachytene vs. Zygotene Package Handler UPS vs. Police Officer Packaging vs. Packing Packed Cell vs. Whole Blood PAD vs. PVD Paddy vs. Rice Paddy vs. SSI Padma Shri vs. Padma Vibhushan Pads vs. Tampons Paella vs. Risotto Pagan vs. Wiccan Pagefile vs. RAM Paging vs. Segmentation Paging vs. Swapping Pah vs. Ph Paid vs. Paid Pain vs. Suffering Paint vs. Varnish Paired Electrons vs. Unpaired Electrons Pakistan vs. USA Paleo Diets vs. Primal Diets Paleolithic Diet vs. Vegan Diet Palindromic Rheumatism vs. Rheumatoid Arthritis Paliperidone vs. Risperidone Palisade Parenchyma vs. Spongy Parenchyma Palladium vs. Platinum Pallet vs. Skid Palmate vs. Pinnate Palmitic Acid vs. Palmitoleic Acid Palmitic Acid vs. Stearic Acid Pan vs. Tan Panadol vs. Panadol Rapid Panasonic Eluga vs. Sony Xperia S Panasonic GH4 vs. Samsung NX1 Panasonic Lumix CM1 vs. Sony Xperia Z4 Panasonic Lumix DMC-FZ100 vs. Sony Cyber-shot DSC-HX5V Panasonic Lumix GF3 vs. Sony NEX-5N Pancake Batter vs. Waffle Batter Pancakes vs. Pikelets Pancetta vs. Prosciutto Pancreas vs. Spleen Pancreatic Amylase vs. Salivary Amylase Pancreatic Cancer vs. Pancreatitis Pancytopenia vs. Thrombocytopenia Panda vs. Sloth Pandora vs. Spotify Paneer vs. Tofu Panel Data vs. Pooled Cross Section Data Panel Data vs. Time Series Pannus vs. Thrombus Panoramic vs. Wide Panspermia vs. Spontaneous Generation Pantech Element vs. Samsung Galaxy Tab 8.9 Pantheon vs. Parthenon Panther vs. Puma Pantothenic Acid vs. Pyridoxine Pants vs. Slacks Pants vs. Trousers Pantyhose vs. Stockings Panzerotti vs. Pizza PaO2 vs. SpO2 PAP Authentication vs. SSO Pap Smear vs. Pelvic Exam Papaya Extract Powder vs. Papaya Powder Papaya Extract vs. Papaya Powder Paper Cup vs. Plastic Cup Papillary Layer vs. Reticular Layer Papillary Muscles vs. Pectinate Muscles Papillitis vs. Papilloedema Paprika vs. Sweet Paprika Papules vs. Pustules Paraben vs. Paraffin Parabens Sulfates vs. Phthalates Paracellular Diffusion vs. Transcellular Diffusion Paradigm vs. Syntagm Paradigm vs. Theory Paradigmatic vs. Syntagmatic Paraganglioma vs. Pheochromocytoma Paragliding vs. Parasailing Paragraph vs. Passage Paragraph vs. Verse Parakeet vs. Parrot Parallel Circuit vs. Series Circuit Parallel Circuits vs. Series Circuits Parallel Communication vs. Serial Communication Parallel Connection vs. Series Connection Parallel Port vs. Serial Port Parallel Projection vs. Perspective Projection Parallel Transmission vs. Serial Transmission Parallel Venation vs. Reticulate Parallelogram vs. Quadrilateral Parallelogram vs. Rectangle Parallelogram vs. Rhombus Parallelogram vs. Trapezoid Parallels vs. VirtualBox Paralysis vs. Paresis Paralysis vs. Paresthesia Paralysis vs. Polio Paramagnetic vs. Superparamagnetic Parameter vs. Statistic Parameter vs. Variable Paranoia Agent vs. Serial Experiments Lain Paraphrase vs. Summary Paraphrasing vs. Quoting Paraphrasing vs. Summarizing Paraplegia vs. Tetraplegia Paraplegic vs. Quadriplegic Parasagittal Plane vs. Sagittal Plane Parasite vs. Parasitoid Parasite vs. Predator Parasites vs. Partial Parasites Parasites vs. Saprophytes Parasites vs. Worms Parasympathetic Nervous System vs. Sympathetic Nervous System Parathyroid Gland vs. Thyroid Gland Paratuberculosis vs. Tuberculosis Paratyphi vs. Salmonella Typhi Parcel Post vs. Priority Mail Parchment Paper vs. Wax Paper Parenchyma vs. Sclerenchyma Parental Type Chromosomes vs. Recombinant Type Chromosomes Parietal Occipital Lobe vs. Temporal Lobe Parietal Pericardium vs. Visceral Pericardium Parietal Pleura vs. Visceral Pleura Parietal Serous Membranes vs. Visceral Paris vs. Rome Parity Flag vs. Sign Flag Park Hopper vs. Park Hopper Plus Parkinson's vs. Rheumatoid Arthritis Parliamentarism vs. Presidentialism Parliamentary Government vs. Presidential Government Parmesan Cheese vs. Pecorino Cheese Parody vs. Satire Parody vs. Spoof Parole vs. Probation Paronychia vs. Subungual Paronychia Parp1 vs. Parp2 Parthenocarpy vs. Parthenogenesis Partial Colectomy vs. Total Colectomy Partial Pressure vs. Vapor Pressure Partial Thromboplastin Time vs. Prothrombin Time Participle vs. Tense Particle Nature of Light vs. Wave Particle Physics vs. Quantum Physics Particle Physics vs. String Theory Partition vs. Volume Partly Cloudy vs. Partly Sunny Partner vs. Spouse Partner vs. Wife Partnership vs. Sole Proprietorship Party vs. Pool Paschen-Back Effect vs. Zeeman Effect Pass the Hash Attack vs. Phishing Attack Pass the Hash Attack vs. Shimming Pass-the-Hash vs. Password Compromise Pass-the-Hash vs. Privilege Escalation Pass the Hash vs. Session Replay Passage Number vs. Population Doubling Passed vs. Past Passion vs. Reason Passivation vs. Pickling Passport Book vs. Passport Card Passport vs. Visa Password History vs. Password Reuse Password Spraying vs. Rainbow Table Past Life vs. Present Life Past Lifestyle vs. Present Lifestyle Past Participle vs. Past Perfect Past Participle vs. Present Participle Past Perfect vs. Past Perfect Continuous Past Perfect vs. Past Simple Past Simple vs. Present Perfect Past vs. Past Participle Past vs. Past Perfect Past vs. Present Perfect Pasta vs. Pizza Pastel vs. SWOT Pasteurization vs. Sterilization Pasteurization vs. Tyndallization Pasteurized Milk vs. Unpasteurized Milk Pastor vs. Preacher Pastor vs. Reverend Patch Cord vs. UTP Cable Patent Ductus Arteriosus vs. Truncus Arteriosus Patent vs. Trademark Path Difference vs. Phase Difference Path Function vs. State Function Path vs. Walk Pathogenesis vs. Pathophysiology Pathogenesis vs. Salutogenesis Pathogenesis vs. Symbiosis Pathogenicity vs. Virulence Pathological Jaundice vs. Physiological Jaundice Pathology vs. Pathophysiology Pathway vs. Plan Pathway vs. Roadmap Patience vs. Patient Patience vs. Perseverance Patience vs. Tolerance Patient Capital Investment vs. Short-Term Aid Patrick Mahomes vs. Tom Brady Pattern vs. Sequence Pause vs. Silence Pause vs. Stop Pause vs. Suspend Pawning vs. Selling Paxil vs. Zoloft Pay vs. Pay for Paycheck vs. Payroll Paycheck vs. Salary Payment Bank vs. Small Finance Bank PayPal vs. eBay PayPal vs. Western Union PBR322 vs. PUC19 PCEF vs. PCRF PCI vs. Priscilla PCI vs. PTCA PCOS vs. Polycystic Ovaries PCR Primer vs. Sequencing Primer PCR Primers vs. Sequencing Primers PCR Test vs. Rapid Test PCR vs. Real-time PCR PCV13 vs. PPSV23 PDA vs. Smartphone PDCA vs. PDSA PDF vs. XPS PDT vs. PST PDU vs. UPS Pea Coat vs. Trench Coat Peach vs. Plum Peacock vs. Peafowl Peacock vs. Peahen Peak to Peak vs. RMS Peak vs. Peek Peanut Butter vs. Sunflower Butter Peasants vs. Serfs Peat Moss vs. Sphagnum Pecans vs. Walnuts Pedicel vs. Peduncle Pedicel vs. Petiole Pedigree vs. Punnett Square Pee vs. Poo Pee vs. Poop Peer Dependence vs. Peer Pressure Peer Influence vs. Peer Pressure Peer Reviewed Journal vs. Refereed Journal Peer-to-Peer Lending vs. Social Lending Pegasys vs. Pegintron Pelican Crossing vs. Puffin Crossing Pelicans vs. Storks Pellagra vs. Scurvy Pelvic Girdle vs. Pelvis Pemphigoid vs. Pemphigus Pemphigus Foliaceus vs. Pemphigus Vulgaris Pen vs. Pencil Penetration Testing vs. Vulnerability Scan Penguin vs. Puffin Penguins vs. Puffins Penicillin G vs. Penicillin V Penicillium vs. Rhizopus Penis vs. Testicles Penis vs. Vagina Penny Board vs. Skateboard Pension Plan vs. Retirement Plan Pension vs. Provident Fund Pentacle vs. Pentagram Pentaerythritol Tetraethylhexanoate vs. Polyglyceryl-3 Polyricinoleate Pentax K-01 vs. Pentax K-5 Pentax K-r vs. Pentax K-x Penultimate Shell vs. Valence Shell Peonies vs. Ranunculus People-Oriented Leadership vs. Transformational Leadership People vs. Person People vs. Persons People's Republic of China vs. Republic of China PeopleSoft vs. SAP Pep vs. Prep Peppermint Oil vs. Rosemary Oil Pepperoni vs. Salami Pepsi vs. Pepsi Max Pepsin vs. Pepsinogen Pepsin vs. Protease Pepsin vs. Renin Pepsin vs. Trypsin Peptidase vs. Protease Peptide vs. Protein Peptides vs. SARMs Peptone vs. Tryptone Percarbonate vs. Sodium Perborate Perceiving vs. Sensing Percent Abundance vs. Relative Abundance Percent Recovery vs. Percent Yield Percent vs. Percentage Percentage vs. Percentile Perception vs. Perspective Perception vs. Reality Perception vs. Sensation Percocet vs. Tylenol Percocet vs. Vicodin Perfect Conductor vs. Superconductor Perfect Forward Secrecy vs. Session Key Perfectly Elastic Collision vs. Perfectly Inelastic Collision Performance Appraisal vs. Performance Management Performance vs. Potential Perfusion vs. Ventilation Pergola vs. Verandah Periapical Abscess vs. Periodontal Abscess Pericardial Friction Rub vs. Pleural Friction Rub Perichondrium vs. Periosteum Period Cost vs. Product Cost Period Cramps vs. Pregnancy Cramps Period Symptoms vs. Pregnancy Period vs. Pregnancy Bleeding Period vs. Pregnancy Spotting Period vs. Spotting Periodic Inventory System vs. Perpetual Inventory System Periodic Motion vs. Simple Harmonic Motion Periodic vs. Perpetual Periodic Waves vs. Progressive Waves Perioral Dermatitis vs. Rosacea Peripheral Arterial Disease vs. Peripheral Vascular Disease Peripheral Arterial Disease vs. Peripheral Venous Disease Peripheral Neuropathy vs. Polyneuropathy Peripheral Parenteral Nutrition vs. Total Parenteral Nutrition Peripheral Proteins vs. Transmembrane Proteins Peristalsis vs. Segmentation Peristomium vs. Prostomium Peritectic vs. Peritectoid Peritonitis vs. Salpingitis Peritubular Capillaries vs. Vasa Recta Perl vs. Python Perlite vs. Zeolite Permanent Hardness of Water vs. Temporary Hardness of Water Permanent Life Insurance vs. Term Life Insurance Permanent Magnets vs. Temporary Magnets Permeability vs. Permittivity Permeability vs. Porosity Permit vs. Visa Pero vs. Sino Peroxide Cure vs. Sulfur Peroxides vs. Phenols Persecution vs. Prosecution Perseverance vs. Persistence Persian vs. Urdu Personal Computer vs. PlayStation 5 Personal Disposable Income vs. Personal Income Personal Ethics vs. Professional Ethics Personal Identity vs. Social Identity Personal Power vs. Positional Power Personal Relationships vs. Working Personal Selling vs. Sales Promotion Personal vs. Personnel Personally vs. Privately Perspective vs. View Perspex vs. Polycarbonate Persuasion vs. Propaganda Pertussis vs. Tuberculosis Pescatarian vs. Vegetarian Pessimism vs. Realism Pessimist vs. Realist PESTEL Analysis vs. SWOT Analysis Petals vs. Sepals Petiole vs. Pulvinus Petrarchan Sonnet vs. Shakespearean Sonnet Petrochemical Engineering vs. Petroleum Engineering Petrolatum vs. Petroleum Jelly Petroleum Benzene vs. Petroleum Ether Petroleum Jelly vs. Vaseline Pewter vs. Silver PEX A vs. PEX B PEX Pipe vs. PVC Pipe PFA Plastic vs. PP Plastic PFA vs. PP PFA vs. PTFE PFA vs. PVC PFA vs. TFM PFAS vs. PFOS PFOA vs. PFOS PFOA vs. PTFE Pfu Polymerase vs. Taq Polymerase PG Certificate vs. PG Dip PGD vs. PGS PGP vs. S/MIME Ph vs. Titratable Acidity Phagocytosis vs. Pinocytosis Phagolysosome vs. Phagosome Phanerogams vs. Pteridophytes Pharisees vs. Rabbis Pharisees vs. Sadducees Pharmacist vs. Pharmacy Technician Pharmacodynamics vs. Pharmacokinetics Pharming vs. Phishing Pharyngitis vs. Tonsillitis Phase Angle vs. Phase Shift Phase I Metabolism vs. Phase II Metabolism Phase in Solution vs. Species Phase of Matter vs. State of Matter Phase vs. Stage Phasic Receptors vs. Tonic Receptors PhD vs. PsyD Phendimetrazine Tartrate vs. Phentermine Phenol vs. Phenyl Phenolphthalein Alkalinity vs. Total Alkalinity Phenolphthalein vs. Thymolphthalein Phenols vs. Polyphenols Phenols vs. Quaternary Ammonium Compound Phenomena vs. Phenomenon Phenomenex Luna 5 µm Phenyl-Hexyl 100 LC Column 250 x 10 mm vs. Zorbax SP-Phenyl Column Phentermine vs. Speed Phenylacetic Acid vs. Proton NMR of Methyl Benzoate Phenylalanine vs. Tyrosine Phenylephrine HCl vs. Pseudoephedrine HCl Phenytoin vs. Phenytoin Sodium Phi vs. Psi Philharmonic vs. Symphony Philippines vs. Vietnam Philosophical Chair vs. Socratic Seminar Philosophical Optimism vs. Philosophical Pessimism Philosophy of Determinism vs. Philosophy of Indeterminism Philosophy vs. Psychology Philosophy vs. Rationale Philosophy vs. Religion Philosophy vs. Science Philosophy vs. Theory Philosophy vs. Theosophy Philosophy vs. Worldview Phishing Resistant vs. Session Cookie Theft Phishing vs. Spear Phishing Phlebitis vs. Thrombophlebitis Phloem vs. Xylem Phloretin CF vs. Skinceuticals CE Ferulic Phocine Distemper Virus vs. Phocine Virus Phone vs. Phoneme Phoneme vs. Stone Phonemes vs. Phones Phonemic Awareness vs. Phonological Awareness Phonetics vs. Phonology Phonics Approach in Reading vs. Syllabic Approach in Reading Phonon vs. Photon Phosgene vs. Phosphine Phosphatase vs. Phosphorylase Phosphate Group vs. Phosphoryl Group Phosphate Mobilizing vs. Phosphate Solubilizing Phosphate vs. Phosphorus Phosphate vs. Potash Phosphatidylcholine vs. Serine Phosphatidylcholine vs. Sphingomyelin Phosphodiester Bond vs. Phosphoester Bond Phospholipids vs. Sphingolipids Phospholipids vs. Triglycerides Phosphoric Acid vs. Phosphorus Phosphoric Acid vs. Sulfuric Acid Photo vs. Photograph Photo vs. Picture Photochromic vs. Thermochromic Photodissociation vs. Photoionization Photoelectric Emission vs. Photoionization Photometry vs. Spectrophotometry Photon Detector vs. Thermal Detector Photon vs. Quantum Photooxidation vs. Photorespiration Photoperiodism vs. Phototropism Photoperiodism vs. Vernalization Photorespiration vs. Photosynthesis Photos vs. iPhoto Photoshop vs. Photoshop Elements Photosynthesis vs. Respiration Photosystem I vs. Photosystem II Phototransistor vs. Relais PHP vs. Python PHP vs. Ruby Phrasal Verb vs. Verb Phrase Phrase vs. Sentence Phrenic Nerves vs. Vagus Phthalic Acid vs. Terephthalic Acid Phthalocyanine vs. Porphyrin Phusion Polymerase vs. Taq Polymerase Phyllosphere vs. Rhizosphere Phylogeny vs. Systematics Phylogeny vs. Taxonomy Physical Asset vs. Productivity Physical Asset vs. Types of Physical Map vs. Political Map Physical Memory vs. Virtual Memory Physical Recreational vs. Recreation Physiological vs. Psychological Phytoestrogens vs. Xenoestrogens Phytomastigophora vs. Zoomastigophora Phytophthora vs. Pythium Phytoplankton vs. Zooplankton Pi Bonds vs. Sigma Bonds Pi Molecular Orbitals vs. Sigma Piaget vs. Vygotsky Picante vs. Salsa Picatinny vs. Weaver Pickerel vs. Pike Picketing vs. Strike Pickup vs. Upbeat PID vs. UTI Pie vs. Pizza Pie vs. Tart Pier vs. Wharf Piezoelectric vs. Piezoresistive Pig Iron vs. Sponge Iron Pig Iron vs. Wrought Iron Pigeon vs. Seagull Pigeon vs. Seashell Pigeon vs. SpongeBob Pika vs. Squirrel Pilates vs. Yoga Piles vs. Ulcerative Colitis Pilgrims vs. Puritans Pilgrims vs. Quakers Pimple vs. Zit Pinched Nerve vs. Pulled Muscle Pinchers vs. Tapers Pineal Gland vs. Pituitary Ping Pong vs. Table Tennis Ping vs. Traceroute Pinguecula vs. Pterygium Pink Butterfly vs. White Mitsubishi Pink Floyd vs. Rush Pink Noise vs. White Noise Pink Salmon vs. Red Salmon Pinnatifid vs. Pinnatisect Pinocytosis vs. Receptor-Mediated Endocytosis Pinot Grigio vs. Pinot Gris Pint vs. Quart Pinworm vs. Ringworm Pinworm vs. Tapeworm Pipe vs. Tube Piperidine vs. Pyrrolidine PIR Infrared vs. Ultrasonic PIR Sensor vs. Ultrasonic Sensor Pirates vs. Privateers Piriformis Syndrome vs. SI Joint Pain Pistil vs. Stamen Pistillate vs. Staminate Pistol vs. Revolver Pistol vs. Rifle Piston vs. Plunger Pitch vs. Tone Pitch vs. Volume Pitcher Plant vs. Venus Flytrap Pits vs. Plasmodesmata Pituitary Dwarfism vs. Thyroid Dwarfism Pity vs. Sympathy Pityriasis Alba vs. Tinea Versicolor Pityriasis Versicolor vs. Vitiligo Pixelate vs. iPhone 14 Pro Pizza Sauce vs. Spaghetti Sauce Pizza Sauce vs. Tomato Sauce pKa vs. pKb PKI vs. PSK PLA vs. PLGA Pla vs. ROM Place vs. Put Placenta Accreta vs. Placenta Increta Placenta Increta vs. Placenta Percreta Placenta vs. Umbilical Cord Placenta vs. Uterus Plaid vs. Tartan Plain vs. Plateau Plain vs. Prairie Plains vs. Plateaus Planarians vs. Tapeworms Plane vs. Section Plane vs. Tree Planet vs. Star Plant-Based vs. Vegan Plant Growth Regulators vs. Plant Hormones Plant Protein vs. Whey Isolate Protein Plant Stanols vs. Plant Sterols Plant vs. Tree Plantar Fasciitis vs. Tarsal Tunnel Syndrome Plaque Psoriasis vs. Psoriasis Plaque vs. Tartar Plasma Exchange vs. Plasmapheresis Plasma Membrane vs. Tonoplast Plasma vs. Serum Plasma vs. Tissue Fluid Plasmid vs. Transposon Plasmid vs. Vector Plasmodium falciparum vs. Plasmodium vivax Plasmolysis vs. Turgidity Plasmolysis vs. Turgor Plastering vs. Rendering Plastering vs. Skimming Plastic Flow vs. Pseudoplastic Flow Plastic Surgery vs. Skin Grafting Plastic vs. Polycarbonate Plastic vs. Polymer Plastic vs. Polypropylene Plastic vs. Resin Plastic vs. Rubber Plastocyanin vs. Plastoquinone Plate Theory vs. Rate Theory Plate vs. Sheet Platelets vs. Red Blood Cells Platform as a Service vs. Software as a Service Platform vs. Pumps Platinum Jewelry vs. White Gold Jewelry Platinum vs. Silver Platinum vs. Tinder Gold Platinum vs. Titanium Platinum vs. White Gold Plato vs. Socrates Plato's Ethics vs. Socrates' Ethics Play vs. Playing Play vs. Pleasure Play vs. Recreation PlayStation 1 vs. Xbox One PlayStation 3 vs. PlayStation 4 PlayStation 3 vs. Xbox 360 PlayStation 4 vs. Sony PlayStation 3 PlayStation 4 vs. Wii U PlayStation 4 vs. Xbox One PlayStation Vita vs. Sony PSP 3000 PlayStation vs. Xbox Pleiotropy vs. Polygenic Inheritance Pleomorphic Adenoma vs. Warthin Tumor Pleural Effusion vs. Pleurisy Pleural Effusion vs. Pneumonia Pleural Effusion vs. Pulmonary Edema Plexiglass vs. Polycarbonate Plot Twist vs. Truck Plot vs. Setting Plot vs. Story Plot vs. Summary Plot vs. Theme Plotter vs. Printer PL/SQL vs. SQL PL/SQL vs. T-SQL Plum Pudding Theory vs. Solid Sphere Theory Plum Tomatoes vs. Roma Tomatoes Plum vs. Prune Plumule vs. Radicle Pluralism vs. Pragmatism Pluralism vs. Unitarism Plurilocular Sporangia vs. Unilocular Pluripotent vs. Totipotent Plutonium vs. Polonium Plutonium vs. Uranium PMI vs. PMP PMP vs. PRINCE2 PMS Symptoms vs. Pregnancy Symptoms Pneumonia vs. Pneumonitis Pneumonia vs. Tuberculosis Pneumonia vs. Walking Pneumonia Pneumothorax vs. Tension Pneumothorax PNG 24 vs. PNG 8 Podcast vs. Vlog Podcast vs. Webcast Poem vs. Poetry Poem vs. Rhyme Poem vs. Sonnet Poem vs. Verse Poetry vs. Prose Poetry vs. Song Point Collar vs. Spread Collar Point Group Symbol vs. Term Symbol Point Group vs. Space Group Point of Purchase vs. Point of Sale Pointer vs. Reference Poison Ivy vs. Poison Oak Poison vs. Toxin Poison vs. Venom Poisonous Snakes vs. Venomous Snakes Pokemon Black vs. Pokemon White Pokemon Blue vs. Pokemon Red Pokemon vs. Yu-Gi-Oh Polar Bonds vs. Polar Molecules Polarimeter vs. Refractometer Polarized Light vs. Unpolarized Light Polarizer vs. UV Filter Polarography vs. Voltammetry Police Officer vs. Sheriff Policies vs. Regulations Policies vs. Rules Policing vs. Traffic Shaping Policy vs. Politics Policy vs. Procedure Policy vs. Protocol Policy vs. Regulation Policy vs. Strategy Polish vs. Wax Political Culture vs. Political Socialization Political Philosophy vs. Political Theory Political Science vs. Politics Politico vs. PoliticusUSA PolitiFact vs. The American Prospect Poll vs. Survey Pollen Tube vs. Style Pollen vs. Pollen Grains Pollen vs. Spore Polo Shirt vs. T-Shirt Polyacrylates vs. Polyesters Polyadelphous Androecium vs. Polyandrous Polyamide vs. Polyester Polyamide vs. Polyimide Polyamides vs. Polypeptides Polyamory vs. Polygamy Polyandry vs. Polygyny Polyaspartic vs. Polyurea Polyatomic Ion vs. Polyvalent Element Polybutene vs. Polybutylene Polycarbonate vs. Polypropylene Polycarbonate vs. Polyurethane Polycrylic vs. Polyurethane Polycyclic Aromatic Hydrocarbons vs. Polynuclear Aromatic Hydrocarbons Polycythemia vs. Polycythemia Vera Polydimethylsiloxane vs. Polysiloxane Polyester Resin vs. Vinyl Ester Polyester vs. Rayon Polyester vs. Satin Polyester vs. Silk Polyester vs. Viscose Polyethersulfone vs. Polysulfone Polyethylene Glycol vs. Propylene Glycol Polyethylene vs. Polyolefin Polyethylene vs. Polypropylene Polyglot vs. Polymath Polyhalite vs. Potash Polyhydroxy Aldehydes vs. Polyhydroxy Ketone Polymer vs. Resin Polymerase vs. Primase Poly(methyl methacrylate) vs. Polycarbonate Polymyalgia Rheumatica vs. Polymyositis Polypeptide vs. Protein Polypropylene vs. Polystyrene Polystyrene vs. Styrene Polystyrene vs. Styrofoam Polysulfide Sealant vs. Polyurethane Sealant Polytechnic vs. University Polyurethane vs. Urethane Polyurethane vs. Varathane Polyurethane vs. Varnish Polyvinyl Acetate vs. Polyvinyl Alcohol POM-C vs. Pom H Pomade vs. Wax Pond Pump vs. Skimmer Ponzi Scheme vs. Pyramid Scheme Ponzi Scheme vs. Social Security Poodle vs. Toy Poodle Pool vs. Snooker Poor Man vs. Rich Man Poor vs. Rich Pop vs. R&B Pop vs. Soda POP3 vs. S/MIME Poplin Shirts vs. Twill Shirts Pop!_OS vs. Zorin OS Popular Sources vs. Scholarly Sources Population Standard Deviation vs. Sample Standard Deviation Population vs. Sample Population vs. Species Populism vs. Progressivism Porcelain vs. Zirconia Porn vs. Sex Pornhub vs. Youporn Pornography vs. Sensuality Porphyrin vs. Protoporphyrin Port Security vs. Screened Subnet Port vs. Sherry Port vs. Socket Port Wine vs. Sherry Port Wine vs. Tawny Wine Portable Air Conditioner vs. Window Air Conditioner Porter vs. Stout Portfolio vs. Programme Portfolio vs. Project Portfolio vs. Resume Portland vs. Seattle Portobello Mushroom vs. Shiitake Mushroom Portuguese vs. Spanish Position vs. Positionality Positionality vs. Standpoint Positionality vs. Standpoint Theory Positive Predictive Value vs. Sensitivity Positivism vs. Postpositivism Positivism vs. Rationalism Positivism vs. Structuralism Positron vs. Proton Possessive Adjectives vs. Possessive Pronouns Possibility vs. Probability Possible vs. Probable Possum vs. Raccoon Possum vs. Rat Post-Positivism vs. Pragmatism Post-Translational Modification vs. Posttranscriptional Modification Postal Code vs. Zip Code Postcentral Gyrus vs. Precentral Gyrus Postcolonialism vs. Structuralism Postfix vs. Prefix Postganglionic Brachial Plexus Injury vs. Preganglionic Postganglionic Neurons vs. Preganglionic Neurons Postgraduate vs. Undergraduate Postincrement vs. Preincrement Postmodernism vs. Poststructuralism Postmortem Clot vs. Thrombus Postpaid Plans vs. Prepaid Plans Postpartum Blues vs. Postpartum Depression Postsecondary Education vs. Secondary Education Poststructuralism vs. Realism Poststructuralism vs. Structuralism Postsynaptic Neuron vs. Presynaptic Neuron Posttranscriptional Gene Silencing vs. Transcriptional Postulate vs. Theorem Posturing vs. Remote Wipe Postzygotic vs. Prezygotic Potassium Acetate vs. Potassium Chloride Potassium Bicarbonate vs. Potassium Carbonate Potassium Bicarbonate vs. Potassium Hydrogen Carbonate Potassium Channels vs. Voltage-Gated Sodium Channels Potassium Chlorate vs. Potassium Perchlorate Potassium Chloride vs. Potassium Citrate Potassium Chloride vs. Potassium Gluconate Potassium Chloride vs. Potassium Phosphate Potassium Chloride vs. Sodium Chloride Potassium Chromate vs. Potassium Dichromate Potassium Citrate vs. Potassium Gluconate Potassium Cyanide vs. Potassium Gold Cyanide Potassium Cyanide vs. Sodium Cyanide Potassium Dichromate vs. Potassium Permanganate Potassium Ferricyanide vs. Potassium Ferrocyanide Potassium Hydroxide vs. Sodium Hydroxide Potassium Iodate vs. Potassium Iodide Potassium Iodine vs. Povidone Iodine Potassium Manganate vs. Potassium Permanganate Potassium Nitrate vs. Potassium Sulfate Potassium Polyacrylate vs. Sodium Polyacrylate Potassium Rich Foods vs. Vitamin K Rich Foods Potassium Sorbate vs. Sugar Potassium Sulfate vs. Urea Potassium vs. Potassium Gluconate Potassium vs. Sodium Potassium vs. Vitamin K Potato Dextrose Agar vs. Sabouraud Dextrose Agar Potato Flour vs. Potato Starch Potato vs. Sweet Potato Potato vs. Tetraspace Potato vs. Tomato Potato vs. Yam Potential Difference vs. Voltage Potential Electrolyte vs. True Potentiometer vs. pH Meter Potentiometer vs. Rheostat Potentiometric Titration vs. Volumetric Pound vs. Quid Pounds vs. Pounds Pounds vs. Stones Pour Plate vs. Spread Plate Power Amplifier vs. Voltage Amplifier Power Series vs. Taylor Series Power Source vs. Power Supply Power vs. Strength Power vs. Torque Power vs. Watts Power vs. Work Power Yoga vs. Yoga PP vs. Pet PP vs. PP-C PP vs. PPCP PP vs. UHMW PPMS vs. RRMS PPROM vs. PROM PPSU vs. PPSU PPSV23 vs. Prevnar 13 PPT vs. PPTX Practicable vs. Practical Practical vs. Pragmatic Practice vs. Practice Practice vs. Technique Practice vs. Theory Pragmatic vs. Visionary Pragmatics vs. Semantics Pragmatism vs. Progressivism Pragmatism vs. Realism Praise vs. Thanksgiving Praise vs. Worship Prakrit vs. Sanskrit Pram vs. Stroller Prawn vs. Shrimp Prawns vs. Shrimps Prayer vs. Supplication Prayer vs. Worship Praying Mantis vs. Walking Stick Pre-Approved vs. Pre-Qualified Pre-mRNA vs. mRNA Preach vs. Prophecy Preach vs. Talk Preaching vs. Teaching Prebiotics vs. Probiotics Precious Stones vs. Semi-Precious Stones Precipitate vs. Supernatant Precis vs. Summary Precognition vs. Premonition Preconditions for Take Off vs. Take Off Precum vs. Sperm Precursor Cells vs. Progenitor Cells Predator vs. Prey Predator vs. Sex Offender Prediction vs. Prophecy Prediction vs. Seagull Predictive Maintenance vs. Preventive Maintenance Prednisolone vs. Prednisone Preface vs. Prologue Prefix vs. Suffix Prefixes vs. Suffixes Prejudice vs. Racism Prejudice vs. Stereotype Premises vs. Property Premium Unleaded vs. Unleaded Prepaid Account vs. Unearned Account Prepending vs. Pretexting Prepending vs. Typosquatting Prerequisite vs. Requisite Presbyterian vs. Presbyterianism Presbyterianism vs. Roman Catholicism Presenile Dementia vs. Senile Dementia Present Continuous vs. Present Perfect Continuous Present Continuous vs. Present Simple Present Perfect vs. Present Perfect Continuous Present Perfect vs. Present Simple President of Iran vs. Supreme Leader of Iran President vs. Prime Minister President vs. Vice President Pressure Cooker vs. Slow Cooker Pressure vs. Thrust Preterm vs. Small for Gestational Age Prevacid vs. Prilosec Preventative vs. Preventive Preventive Access Control vs. Technical Preventive Access Control vs. Technical Access Control Prevoost Reaction vs. Woodward Pride vs. Proud Pride vs. Vanity Prilosec vs. Prilosec OTC Prilosec vs. Zantac Primary Active Transport vs. Secondary Active Transport Primary Active Transporter vs. Secondary Active Transporter Primary Addison's Disease vs. Secondary Addison's Disease Primary Alcohol vs. Secondary Alcohol Primary Allylic Carbocations vs. Secondary Allylic Carbocations Primary Antibody vs. Secondary Antibody Primary Asset Market vs. Secondary Market Primary Asset Markets vs. Secondary Markets Primary Care vs. Secondary Care Primary Cell Culture vs. Secondary Cell Culture Primary Cells vs. Secondary Cells Primary Data vs. Secondary Data Primary Dentin vs. Secondary Dentin Primary Deviance vs. Secondary Deviance Primary Education vs. Secondary Education Primary Embryonic Induction vs. Secondary Embryonic Induction Primary Follicle vs. Primordial Follicle Primary Growth vs. Secondary Growth Primary Hemostasis vs. Secondary Hemostasis Primary Hypertension vs. Secondary Hypertension Primary Hypogonadism vs. Secondary Hypogonadism Primary Immune Response vs. Secondary Immune Response Primary Infertility vs. Secondary Infertility Primary Insomnia vs. Secondary Insomnia Primary Key vs. Unique Key Primary Lymphoid Organs vs. Secondary Lymphoid Organs Primary Lysosomes vs. Secondary Lysosomes Primary Market vs. Secondary Market Primary Markets vs. Secondary Markets Primary Memory vs. Secondary Memory Primary Metabolites vs. Secondary Metabolites Primary Minerals vs. Secondary Minerals Primary Mycelium vs. Secondary Mycelium Primary Pollutants vs. Secondary Pollutants Primary Polycythemia vs. Secondary Polycythemia Primary Research vs. Secondary Research Primary Screening Industrial Microbiology vs. Secondary Screening Industrial Microbiology Primary Secondary vs. Tertiary Halogenoalkanes Primary Sexual Characteristics vs. Secondary Sexual Characteristics Primary Sjögren's Syndrome vs. Secondary Sjögren's Syndrome Primary Socialization vs. Secondary Socialization Primary Somatosensory Cortex vs. Secondary Somatosensory Cortex Primary Sources vs. Secondary Sources Primary Succession vs. Secondary Succession Primary Tuberculosis vs. Secondary Tuberculosis Primary Valency vs. Secondary Valency Primary Xylem vs. Secondary Xylem Prime Factors vs. Prime Number Prime Rib vs. Ribeye Prime Rib vs. Sirloin Primer vs. Probe Primer vs. Promoter Primitive Cell vs. Unit Cell Primitive Type vs. Wrapper Class Prince Charles vs. Prince William Princess vs. Queen Principal vs. Principle Principle vs. Theory Principle vs. Values Principles vs. Theories Principles vs. Values Prion vs. Virus Prions vs. Viroids Priority Mail vs. USPS Express Priority Mail vs. USPS First Class Prism vs. Pyramid Privacy vs. Security Private Administration vs. Public Administration Private Cloud vs. Public Cloud Private Companies vs. Public Companies Private Equity vs. Venture Capital Private Hospitals vs. Public Hospitals Private IP vs. Public IP Private Key vs. Public Key Private Law vs. Public Law Private Market vs. Public Market Private Markets vs. Public Markets Private Procurement vs. Public Procurement Private School vs. Public School Private Schooling vs. Public Schooling Private Schools vs. Public Schools Private Sector Bank in India vs. Public Sector Bank in India Private Sector vs. Public Sector Privilege vs. Right Privileges vs. Rights Pro vs. Ultra Proactive Protocols vs. Reactive Protocols Proactive Purchasing vs. Reactive Purchasing Proactive Risk Management vs. Reactive Risk Management Proactive Strategies vs. Reactive Strategies Proactive vs. Reactive Probability Density Function vs. Probability Distribution Function Probability Distribution vs. Random Variables Probability vs. Statistics Probable Cause vs. Reasonable Suspicion Probe vs. VNTR Probiotics vs. Synbiotics Problem Definition Phase vs. Scientific Problem Definition Phase vs. Scientific Method Problem Definition Phase vs. Scientific Methods Problem Definition Phase vs. SM Problem Definition Phase vs. SMS Problem Definition Phrase vs. Scientific Methods Problem Definition vs. Scientific Method Problem Definition vs. Scientific Methods Problem Design Phase vs. Scientific Method Problem Generating Phase vs. Scientific Method Problem Solving vs. Research Problem vs. Symptom Problems Concerning the Scope and Limits of Assemblage Freedom in South Africa vs. Problems Regarding Tensions Between Assemblage Freedom and Competing South African Constitutional Considerations Such as Public Order and Safety Procedural Law vs. Substantive Law Procedure Definition Phase vs. Scientific Method Procedure Design Phase vs. Scientific Method Procedure Design Phase vs. Scientific Methods Procedure Design Phase vs. SMS Procedure Design vs. Scientific Methods Procedure vs. Protocol Procedure vs. Work Instruction Procedures Design Phase vs. Scientific Methods Process Costing vs. Standard Costing Process FMEA vs. System FMEA Process vs. Strategy Process vs. Thread Processes vs. Threads Processor vs. RAM Prochirality vs. Prostereoisomerism Procurement vs. Purchase Procurement vs. Purchasing Procurement vs. Sourcing Prodigy vs. Savant Producer Gas vs. Water Gas Product Marketing vs. Service Marketing Product vs. Service Product vs. Substrate Production vs. Productivity Productive Behavior vs. Unproductive Behavior Products vs. Reactants Profane vs. Sacred Profession vs. Vocation Professional Networking vs. Social Networking Professor vs. Teacher Proficiency vs. TOEFL Profit Maximization vs. Wealth Maximization Profit vs. Profitability Profit vs. Revenue Profit vs. Surplus Profit vs. Turnover Progenitor Cells vs. Stem Cells Progesterone vs. Progestin Program Developer vs. Tester Program vs. Programme Program vs. Project Programme vs. Project Programme vs. Scheme Progress vs. Racism Progression vs. Rubric Progressive Magazine vs. Raw Story Progressive Metamorphosis vs. Retrogressive Metamorphosis Progressive Staining vs. Regressive Staining Progressive Wave vs. Stationary Wave Prohibited vs. Restricted Project Leader vs. Project Manager Project Manager vs. Release Train Engineer Project vs. Workstream Prolapsed Bladder vs. Prolapsed Uterus Proliferative Endometrium vs. Secretory Endometrium Prom Dress vs. Wedding Dress Promethazine Hydrochloride vs. Theobromine Pronation vs. Supination Prone Position vs. Supine Position Prone vs. Supine Pronunciation vs. Spelling Prop Root vs. Stilt Root Propagation vs. Transmission Propan-1-ol vs. Propan-2-ol Propanal vs. Propanone Proper Subsets vs. Subsets Property vs. Sovereignty Prophage vs. Provirus Prophase I vs. Prophase II Proportion in Architecture vs. Scale in Architecture Proportion vs. Ratio Proportion vs. Scale Proposal vs. Recommendation Proposal vs. Report Propylene vs. Propylene Carbonate Prosperity vs. Wealth Prostate Cancer vs. Prostatitis Prostate Cancer vs. Testicular Cancer Prostate Gland vs. Seminal Vesicle Protandry vs. Protogyny Protease vs. Proteasome Protease vs. Proteinase Protease vs. Proteinase K Protect vs. Safeguard Protection vs. Security Protective Order vs. Restraining Order Protective Rights vs. Substantive Rights Protective vs. Safeguard Protein A vs. Protein G Protein Digestion in Stomach vs. Small Intestine Protein Enzymes vs. Ribozymes Protein Kinase A vs. Protein Kinase C Protein vs. Whey Protein Proteolytic Enzymes vs. Systemic Proteomics vs. Transcriptomics Protest vs. Riot Proteus Mirabilis vs. Proteus Vulgaris Proteus Mirabilis vs. Providencia Stuartii Proteus Mirabilis vs. Salmonella Enteritidis Prothallus vs. Protonema Prothallus vs. Thallus Prothrombin vs. Thrombin Protista vs. Protozoa Protoplasm vs. Protoplast Protoplasts vs. Spheroplasts Protostele vs. Siphonostele Prototropy vs. Tautomerism Proverb vs. Saying Proverbs vs. Quotes Province vs. State Province vs. Territory Provirus vs. Retrovirus Provision vs. Reserve Proximate Analysis of Coal vs. Ultimate Analysis of Coal Proximate Analysis vs. Ultimate Analysis Proxy vs. Reverse Proxy Prozac vs. Zoloft PRP vs. Stem Cell Therapy PS vs. Xbox PS3 vs. Sony PlayStation 2 PS3 vs. Xbox 360 PS4 vs. PS5 PS5 vs. Xbox PS5 vs. Xbox One PS5 vs. Xbox Series X PSA Diagnostic vs. PSA Screening Pseudo Critical Properties vs. True Pseudo Ruminant Systems vs. Ruminant Systems Pseudoephedrine vs. Speed Pseudomonas aeruginosa vs. Pseudomonas fluorescens Pseudomonas vs. Staphylococcus Pseudoplastic vs. Thixotropic Pseudoptosis vs. Ptosis Pseudoscience vs. Science Pseudostratified Epithelial Tissue vs. Simple Stratified Pseudostratified Epithelium vs. Transitional Epithelium Pseudounipolar Neuron vs. Unipolar Neuron Psilomelane vs. Pyrolusite Psoriasis vs. Seborrheic Dermatitis Psoriasis vs. Vitiligo PSP 2000 vs. PSP 3000 PSP Go vs. Sony PlayStation Vita (PS Vita) PSPgo vs. Sony PlayStation Portable PSP-3000 Psychiatrist vs. Psychologist Psychiatrist vs. Therapist Psychiatry vs. Psychology Psychoanalytic vs. Psychodynamic Psychological vs. Psychosocial Psychologist vs. Therapist Psychology vs. Science Psychology vs. Social Psychology Psychology vs. Sociology Psychopath vs. Sociopath Psychrophiles vs. Psychrotrophs PT vs. PTT Pteranodon vs. Pterodactyl Pteridophyta vs. Thallophyta PTFE vs. PVDF PTFE vs. RPTFE PTFE vs. Viton Pth vs. TSH PTMT vs. PVC PTSD vs. Schizophrenia Pub vs. Tavern Pubic Lice vs. Scabies Public Corporation vs. Sole Proprietorship Public Key Encryption vs. Symmetric Key Encryption Public Relations vs. Publicity Public vs. Red Tapeism Public Water vs. Spring Water Pudendal Neuralgia vs. Vulvodynia Puerperal Pyrexia vs. Puerperal Sepsis PUFA vs. Saturated Fat Puff Pastry vs. Shortcrust Pastry Puffins vs. Penguins Pull vs. Tug Pulled Quad Muscle vs. Torn Quad Muscle Pullover vs. Sweater Pulmonary Artery Occlusive Pressure vs. Pulmonary Artery Wedge Pressure Pulmonary Artery vs. Pulmonary Vein Pulmonary Artery Wedge Pressure vs. Swan-Ganz Catheter Pulmonary Circuit vs. Systemic Circuit Pulmonary Circulation vs. Systemic Circulation Pulsar vs. Quasar Pulsatile Tinnitus vs. Tinnitus Pulse Input vs. Step Input Pulse vs. Pulse Pressure Pulse vs. Wave Pump vs. Turbine Pumpkin vs. Pumpkin Puree Pumpkin vs. Squash Pumps vs. Stilettos Punishment vs. Reinforcement Punjabi vs. Sikh Punk vs. Rock Punk vs. Scene Pupil vs. Student Purchase Ledger vs. Sales Ledger Pure Capitalism vs. Regulated Capitalism Pure Essence vs. Rune Essence Pure Virtual Function vs. Virtual Function Puree vs. Tomato Paste Purification vs. Separation Purified Water vs. Spring Water Purine Synthesis vs. Pyrimidine Synthesis Purine vs. Pyrimidine Purines vs. Pyrimidines Puritans vs. Separatists Purple vs. Violet Purse vs. Wallet Push-Up Bra vs. Regular Bra Put Up With vs. Tolerate Put vs. Zelensky Putin vs. Zelensky PVA Glue vs. Wood Glue PVA vs. PVC PVC vs. Pack PVC vs. PVDC PVC vs. uPVC PVC vs. Vinyl PVC vs. XLPE PVD vs. Pad Px Py Orbitals vs. Pz Orbitals Pyramid of Biomass vs. Pyramid of Energy Pyranometer vs. Pyrheliometer Pyridine vs. Pyrimidine Pyridoxal 5 Phosphate vs. Pyridoxine Hydrochloride Pyridoxal vs. Pyridoxamine Pyrolysis Carbonization vs. Torrefaction Pyrosequencing vs. Sanger Sequencing Pyruvate vs. Pyruvic Acid Python vs. R Python vs. Ruby