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O Negative vs. O Positive O-Xylene vs. P-Xylene Oar vs. Paddle Oatmeal vs. Oats Oats vs. Porridge Oats vs. Wheat Barley Obaid vs. Ubaid Obama vs. Trump Obedience vs. Submission Obese vs. Overweight Obesity vs. Overweight Obfuscation Toolkit vs. Version Control Obfuscation vs. Steganography Object Code vs. Source Code Object Dereference vs. Pointer Dereference Object-Oriented Programming vs. Procedural Programming Object-Oriented Programming vs. Structured Programming Object Program vs. Source Program Object Pronouns vs. Subject Object vs. Subject Objective-C vs. Swift Objective Science vs. Transgender Ideology Objective vs. Purpose Objective vs. Subjective Objective vs. Vision Objective World vs. Subjective World Objectives vs. Outcomes Objectives vs. Strategic Themes Objectivity vs. Subjectivity Obligate Aerobes vs. Obligate Anaerobes Obligated vs. Obliged Obligation vs. Responsibility Obligation vs. Rights Oblique Plane vs. Transverse Plane Obsessive Compulsive Disorder vs. Obsessive-Compulsive Personality Disorder Obsidian vs. Silica Obsidian vs. Tourmaline Obstructive Lung Disease vs. Restrictive Lung Disease Obstructive Pulmonary Disease vs. Restrictive Pulmonary Disease Occupation vs. Profession Occupational Therapy vs. Physical Therapy OCD vs. OCPD Ocean vs. Sea Ocean vs. Sky OCT Spectral Domain vs. Time Domain Octahedral Molecules vs. Trigonal Planar Molecules Octahedral Voids vs. Tetrahedral Voids Octopus vs. Squid Oculus Go vs. Oculus Quest 2 Oculus Rift vs. PlayStation VR Oculus Rift vs. Samsung Gear VR ODBC vs. OLEDB Odds vs. Probability ODI vs. Test Cricket Odin vs. Zeus ODM vs. OEM Odor vs. Smell OEE vs. Rams OEM vs. Retail Of vs. To OFDM vs. OFDMA Off-Balance Sheet vs. On-Balance Sheet Off-Trade vs. On-Trade Off vs. On Offence vs. Offense Offer for Sale vs. Offer for Subscription Offering vs. Tithe Office 2007 vs. Office 2010 Office 2016 vs. Office 365 Office Equipment vs. Stationery OfficeJet Printers vs. Photosmart Printers Official Transcripts vs. Unofficial Transcripts Offline Cat vs. Online Casino Offline UPS vs. Online UPS Offshore Earthing vs. Onshore Earthing Offshore vs. Onshore Offshoring vs. Outsourcing Offsite Storage vs. Onsite Storage Og vs. Retro OGT Tablet vs. Samsung Galaxy Tab 8.9 Oil-Based Paint vs. Water Oil in Water vs. Water-in-Oil Emulsion Oil Pastels vs. Pastels Oil vs. Petrol Oil vs. Water Oil vs. Wax OLAP vs. OLTP OLED Display vs. QLED Display Olefin vs. Polypropylene Olefins vs. Paraffins Oleic Acid vs. Stearic Acid Oleum vs. Sulfuric Acid Oligarchy vs. Plutocracy Oligo dT vs. Random Primers Oligodendrocytes vs. Schwann Cells Oligohydramnios vs. Polyhydramnios Oligomer vs. Polymer Oligomer vs. Prepolymer Oligonucleotide vs. Polynucleotide Oligopeptide vs. Polypeptide Oligopoly vs. Perfect Competition Olive Oil vs. Vegetable Oil Olives vs. Peanut Butter Omega-3 Fatty Acids vs. Omega-6 Fatty Acids Omelette vs. Scrambled Egg Omentum vs. Peritoneum Omeprazole vs. Omeprazole Magnesium Omeprazole vs. Pantoprazole Omeprazole vs. Prevacid Omeprazole vs. Zantac Omnibuses vs. Omnibuses On vs. Upon Onboarding vs. Orientation Oncogene vs. Tumor Suppressor Gene Oncogenes vs. Oncoprotein Oncogenes vs. Proto-Oncogenes One Molecule of Compound vs. One Molecule of Element One-Time Passwords vs. Push Notifications One vs. One and One Fourteenth One vs. Two One-Way ANOVA vs. Two-Way ANOVA Onion vs. Shallot Onions vs. Shallots Online Education vs. Traditional Education Online News vs. TV Online Newspaper vs. Printed Newspaper Online System vs. Real-Time System Onset vs. Outset Ontogeny vs. Phylogeny Ontology vs. Taxonomy Onus of Proof vs. Standard of Proof OODBMS vs. RDBMS Oogenesis vs. Spermatogenesis Oomycetes vs. True Fungi Oomycetes vs. Zygomycetes OOP vs. Pop Open Heart Surgery vs. Triple Bypass Open Relationship vs. Relationship Open Source Software vs. Proprietary Software Open Tubular Columns vs. Packed Columns Open vs. Open Up Openleaks vs. Wikileaks OpenOffice vs. Word OpenVPN vs. PPTP Opera vs. Opera Mini Operational Audit vs. SOX Operational Feasibility vs. Organizational Feasibility Operational Planning vs. Strategic Planning Operations Management vs. Production Operations Management vs. Project Management Operations Management vs. Supply Chain Management Operations Manager vs. Project Manager Operator vs. Promoter Operculum vs. Peristome Operon vs. Regulon Ophthalmologist vs. Optometrist Ophthalmology vs. Optometry Opinion vs. Perception Opossum vs. Possum Opportunistic Mycoses vs. Systemic Opportunity Cost vs. Sunk Cost Opportunity Cost vs. Trade-off Oppression vs. Repression Oppression vs. Suppression Opsonization vs. Phagocytosis Optic Nerve vs. Optic Tract Optical Isomers in Carbohydrates vs. Structural Optical Mouse vs. Physical Mouse Optician vs. Optometrist Optimal vs. Optimum Optimism vs. Pessimism Optimism vs. Realism Optimist vs. Pessimist Optimus Black vs. Samsung Infuse 4G Option vs. Warrant Options vs. Swaps Optus Galaxy S II vs. Telstra Galaxy S2 Optus Galaxy S II vs. Vodafone Galaxy S2 Oracle Data Guard vs. Oracle Real Application Clusters (RAC) Oracle vs. SAP Oracle vs. SQL Server Oral Communication vs. Written Communication Oral Report vs. Written Report Oral Thrush vs. White Sponge Nevus Oral vs. Verbal Orange vs. Red Orange vs. Tangerine Orbit vs. Orbital Orbital Angular Momentum vs. Spin Orchestra vs. Symphony Ordain vs. Tonsure ORDBMS vs. RDBMS Ordinance vs. Sacrament Ordinary Dividends vs. Qualified Dividends Ordinary Flu vs. Swine Flu Ordinary Light vs. Plane Polarized Light Ordinary Shares vs. Preference Shares Oregon vs. Washington Organ-Specific Manifestations vs. Tissue-Specific Manifestations Organ vs. Organelle Organ vs. Piano Organ vs. Tissue Organic Intellectuals vs. Traditional Intellectuals Organic Peanut Butter vs. Sunflower Butter Organism vs. Orgasm Organizational Development vs. Organizational Transformation Organochlorine Pesticides vs. Organophosphate Organochlorine vs. Organophosphate Organogenesis vs. Somatic Embryogenesis Organoids vs. Spheroids Organosilicon vs. Silicone Orientation vs. Socialization Orientation vs. Training Orifice vs. Venturi Original Apple MacBook Battery vs. Replacement Batteries Original Evidence vs. Real Evidence Ortho Hydrogen vs. Para Hydrogen Ortho-Nitrophenol vs. Para-Nitrophenol Orthoclase vs. Plagioclase Orthodox Christianity vs. Orthodox Judaism Orthodox Jew vs. Zionist Jew Orthodox Judaism vs. Reform Judaism Orthodox Seeds vs. Recalcitrant Seeds Orthogonal vs. Orthonormal Orthologous Genes vs. Paralogous Genes Orthomyxovirus vs. Paramyxovirus Orthopedic Surgeon vs. Podiatrist Orthophosphate vs. Polyphosphate Orthophosphoric Acid vs. Phosphoric Acid Orthopnea vs. PND Orthosis vs. Prosthesis Orthostatic Hypotension vs. POTS Orthostatic Hypotension vs. Vasovagal Syncope Oryza glaberrima vs. Oryza sativa OS X Mavericks vs. OS X Yosemite OSB vs. Plywood Oscar vs. Valeria Oscillation vs. Simple Harmonic Motion Oscillation vs. Vibration Oscillation vs. Wave Oscillatory Motion vs. Periodic Motion OSI Model vs. TCP/IP Model Osmium Tetroxide vs. Potassium Permanganate Osmoconformers vs. Osmoregulators Osmolality vs. Osmolarity Osmolarity vs. Tonicity Osmoregulation vs. Thermoregulation Osmosis vs. Photosynthesis Osmosis vs. Plasmolysis Osmotic Diarrhea vs. Secretory Diarrhea Osmotic Potential vs. Water Potential OSPF vs. RIP Osteoarthritis vs. Osteoporosis Osteoarthritis vs. Patellofemoral Pain Syndrome Osteoarthritis vs. Rheumatoid Arthritis Osteoblasts vs. Osteoclasts Osteoblasts vs. Osteocytes Osteogenesis Imperfecta vs. Osteoporosis Osteomalacia vs. Osteomyelitis Osteomalacia vs. Osteoporosis Osteomalacia vs. Rickets Osteomyelitis vs. Septic Arthritis Osteopath vs. Physiotherapist Osteopenia vs. Osteoporosis Osteoporosis vs. Scoliosis Ostrich vs. Rhea Ostwald Viscometers vs. Ubbelohde Viscometers OT vs. PT Otitis Externa vs. Otitis Media OTT vs. VOD Ought To vs. Should Ounce vs. Troy Ounce Ounces vs. Pounds Out vs. Ref Outbreeding vs. Purebreeding Outlet vs. Store Outsourced Code Development vs. Supply Chain Risk Outsourced Code Development vs. Supply Chain Risks Ovarian Cancer vs. Ovarian Cyst Ovaries vs. Testicles Ovary vs. Ovule Ovary vs. Uterus Oven vs. Range Oven vs. Tandoor Over-the-Counter Drugs vs. Prescription Drugs Overactive Bladder vs. UTI Overall Stability Constants vs. Stepwise Stability Constants Overcapitalization vs. Overtrading Overcoat vs. Trench Coat Overconfidence vs. Self-Confidence Overloading vs. Overriding Overtone vs. Undertone Oviparous vs. Viviparous Ovum vs. Secondary Oocyte Ownership vs. Possession Owo vs. Uwu Oxalate vs. Oxalic Acid Oxidases vs. Oxygenases Oxidation Ditch vs. Oxidation Pond Oxidation Number vs. Oxidation State Oxidation Number vs. Valency Oxidation Reaction vs. Reduction Reaction Oxidation State vs. Valency Oxidation vs. Oxygenation Oxidation vs. Reduction Oxidative Ozonolysis vs. Reductive Ozonolysis Oxidative Phosphorylation vs. Photophosphorylation Oxidative Phosphorylation vs. Substrate Level Phosphorylation Oxidizing Agent vs. Reducing Agent Oxidizing Flame vs. Reducing Flame Oxidoreductase vs. Reductase Oxo Process vs. Wacker Process Oxycodone vs. Percocet OxyContin vs. Oxycodone Oxygen Absorber vs. Silica Gel Oxygen Concentrator vs. Oxygen Cylinder Oxygen vs. Ozone Oxygenation vs. Ventilation Oxymoron vs. Paradox Oxyntic Cells vs. Peptic Oxytocin Hormone vs. Prolactin Hormone Oxytocin vs. Prostaglandin