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R-32 vs. R-33 R-Carvone vs. S-Carvone R-Chart vs. S-Chart R Configuration vs. S Configuration R Value vs. U-Value R134a vs. R600a R32 GT-R vs. R32 GTS R32 vs. R33 R32 vs. R410A R6 Bike vs. R7 Bike Rab GTP vs. Ran GTP Rabies vs. Tetanus Rabies vs. Zombie Rabipur vs. Verorab Race One Node vs. Rack One Node Race vs. Racism Race vs. Species Racing vs. Unhurried Racism vs. Stereotype Rack vs. Shelf Rack vs. Stand Racket vs. Rod Racquetball vs. Squash Radar vs. Sonar Radial Cleavage vs. Spiral Cleavage Radial Tire vs. Tubeless Tire Radial vs. Radiated Radiating Pain vs. Shooting Pain Radiation vs. Radioactivity Radiation vs. Radiotherapy Radical Left vs. Super Radical Left Radical vs. Socialist Radical vs. Valency Radioactivity vs. Transmutation Radiography vs. Radiology Radioisotopes vs. Stable Isotopes Radiometric Dating vs. Relative Dating Radium vs. Radon RADIUS vs. SAML RADIUS vs. TACACS Radius vs. Ulna Raf vs. Soup Rafael Nadal vs. Roger Federer Rafters vs. Trusses Rag and Bone vs. Theory Rage Against the Machine vs. System of a Down RAID 0 vs. RAID 1 RAID 0 vs. RAID 5 RAID 1 vs. RAID 5 RAID 1 vs. RAID 6 RAID 10 vs. RAID 5 RAID 10 vs. RAID 6 RAID 5 vs. RAID 6 Raiden vs. Scorpion Raiden vs. Thomas Rail vs. Road Rail vs. Train Railgun Tank vs. Stick Railroad vs. Railway Railway vs. Train Rain Silver the Northern Sergal vs. Rock Rain vs. Showers Rain vs. Sleet Rain vs. Sun Rainbow Dash vs. Twilight Sparkle Raincoat vs. Trench Coat Raincoat vs. Windbreaker Rainy Days vs. Sunny Days Raise vs. Rear Raise vs. Rise Raised vs. Uplifted Raising Cane's vs. Wingstop Raisins vs. Sultanas Rales vs. Rhonchi Ralph McDaniels vs. Video Music Box RAM Memory vs. Swap Memory RAM vs. ROM Ram vs. Sheep RAM vs. SRAM Ramayana vs. Ramcharitmanas Ramen vs. Spaghetti Ramen vs. Udon Ramjet vs. Scramjet Ramsin vs. Refutation Ranbir Kapoor vs. Shahid Kapoor Random Error vs. Systematic Error Random Errors vs. Systematic Errors Random Mutagenesis vs. Site-Directed Mutagenesis Random Scan Display vs. Raster Scan Display Random Scan vs. Raster Scan Random Variable vs. Variable Randomized Algorithm vs. Recursive Algorithm Range of Wavelengths vs. Specific Wavelengths Range vs. Rate Range vs. Stove Ranger vs. Special Forces Rankine Cycle vs. Refrigeration Cycle Ranni the Witch vs. The Elden Beast Ransomware vs. Scareware Rap Misogyny vs. Rap Philogyny Rap Music vs. Soul Music Rap vs. Trap Rap vs. William Shakespeare Rape vs. Sexual Assault Rapid Rewards vs. SkyMiles Rapid vs. Uber Rapid vs. Waterfall Rappelling vs. Rock Climbing Rapping vs. Singing Raptor vs. T-Rex RAR vs. ZIP Rare Earth Magnet vs. Regular Magnet Rarely vs. Seldom Raspberry vs. Strawberry Raster Graphics vs. Vector Graphics Rat vs. Yard Rate Centering Servo Valve vs. Servo Valve Rate Centering Valve vs. Servo Valve Rate Centering vs. Servo Valve Rate Constant vs. Reaction Rate Rate Expression vs. Rate Law Rate of Vaporization vs. Vapour Pressure Rate vs. Ratio Ratification vs. Rectification Rational Choice Institutionalism vs. Sociological Institutionalism Rational vs. Reasonable Rationalism vs. Stoicism Rationality vs. Realism Rattan vs. Wicker Rava vs. Sooji Ravello vs. Sorrento Raven vs. Writing Desk Ravioli vs. Tortellini Raw Sugar vs. White Sugar Raw vs. Smackdown Raw vs. Uncooked Ray Allen vs. Stephen Curry Rayon vs. Sateen Rayon vs. Viscose Rays vs. Skates Razor vs. Trimmer R&B Misogyny vs. R&B Philogyny R&B Music vs. Soul Music RB750 vs. RB940 RB750 vs. RB941 RBA vs. STS RBI vs. SBI RBI vs. SEBI RCC vs. Steel RDB vs. Transactional DB RDP vs. SDP Re vs. Structural Capital Reach vs. Succeed Reactance vs. Resistance Reactant vs. Reagent Reaction Rate vs. Reaction Time Reaction Rate vs. Specific Rate Constant Reaction vs. Reflex Reactive Arthritis vs. Rheumatoid Arthritis Reactive vs. Selfish Read vs. Recite Reading Critical vs. Reading for Pleasure Reading Speed vs. Reading Volume Reading Speed vs. Thinking Speed Reading Volume vs. Vocabulary Reading vs. Studying Reading vs. TV Reading vs. Writing Real Estate Agent vs. Realtor Real Image vs. Virtual Image Real Images vs. Virtual Images Real-Time Operating System vs. Time Sharing Real-Time PCR vs. Reverse Transcriptase Real-Time PCR vs. Reverse Transcriptase PCR Real vs. Reality Realism Literature vs. Victorian Literature Realism vs. Regionalism Realism vs. Romanticism Realism vs. Socialist Realism Realism vs. Structural Realism Realism vs. Vanguard Realism vs. Victorian Novel Realities vs. Representations Reality vs. Social Construct Reality vs. Transgender Ideology Reality vs. Truth Realization vs. Recognition Realize vs. Understand Realized Gains vs. Unrealized Gains Realized Income vs. Recognized Income Realized Loss vs. Unrealized Loss Really Cold vs. Severely Cold Really Cold vs. So Cold Really Cold vs. Truly Cold Really Tall vs. Very Tall Really vs. Severely Really vs. So Really vs. Too Really vs. Truly Really vs. Very Really vs. Way Really vs. Wow Realm vs. SQLite Rear vs. Rump Reason Magazine vs. The Intercept Reason vs. Undeadon Reason vs. Unreason Reasoning vs. Thinking Rebate vs. Refund Rebellion vs. Revolution Rebirth vs. Reincarnation Rebonding vs. Smoothing Rebonding vs. Straightening Reboost vs. Red Bull Rebuke vs. Reproach Rebut vs. Refute Rebut vs. Repudiate Recall vs. Remember Recall vs. Retrieve Recall vs. Review Receiver Public Key vs. Sender Public Key Recently vs. These Days Receptionist vs. Secretary Recharge vs. Top Up Reciprocal Cross vs. Test Cross Reciprocal Translocation vs. Robertsonian Reciprocating Pump vs. Rotary Pumps Recirculation vs. Recycle Recognition vs. Reward Recombinant DNA vs. Recombinant Protein Recombinants vs. Transformants Recommend vs. Suggest Reconstruction Judaism vs. Reform Judaism Record of the Year vs. Song of the Year Recordable vs. Rewritable Recordation vs. Registration Recorded Delivery vs. Special Delivery Recorded vs. Registered Recourse vs. Reliance Recruitee vs. SmartRecruiters Recruiting vs. Staffing Recruiting vs. Talent Acquisition Recruitment vs. Selection Rectal Prolapse vs. Rectocele Rectangle vs. Rhombus Rectangle vs. Square Rectangles vs. Squares Rectangular Prism vs. Tetrahedron Rectify vs. Redress Rectifying Section vs. Stirring Vection Rectifying Section vs. Stripping Section Rectifying vs. Stripping Rectilinear Motion vs. Translatory Motion Recurring vs. Usage Recycle vs. Restore Recycle vs. Reuse Recycle vs. Upcycle Red Blood Cell vs. White Blood Cell Red Blood Cells vs. White Blood Cells Red Bone Marrow vs. Yellow Bone Marrow Red Bull vs. Red Bull Sugar Free Red Bull vs. Red Bull Sugarfree Red Bull vs. Switch Red Clover vs. Rosehips Red Hood vs. Yellow Red Light Camera vs. Traffic Camera Red Meat vs. White Meat Red Miso vs. White Miso Red Onions vs. Yellow Onions Red Oxide Primer vs. Zinc Chromate Primer Red Phosphorus vs. White Phosphorus Red Quinoa vs. White Quinoa Red Rice vs. White Rice Red Seal vs. Red Seal Trade Red Sox vs. Yankees Red Team vs. Threat-Hunting Team Red vs. Red Red vs. Strips Red vs. Yellow Red Wine Glasses vs. White Wine Glasses Red Wine vs. Whiskey Red Wine vs. White Wine Redacted vs. The Hill Redbone Men vs. Redbone Women Redbone Woman vs. Tanned Woman Redbone Woman vs. White Woman Redbull vs. Score Reddit vs. Urban Dictionary Redeem vs. Restore Redeeming vs. Redemptive Redefine vs. Reform Redress vs. Remedy Redtube vs. Xhamster Redtube vs. YouPorn Reducing Power vs. Reduction Potential Reducing Sugar vs. Starch Reductive Amination vs. Transamination Reek vs. Stench Reek vs. Stink Reel vs. Slide Reels vs. Shorts Refer to vs. Talk About Referee vs. Umpire Reference Book vs. Textbook Reference Type vs. Value Type Reference vs. Sense Referential Theory vs. Semantic Triangle Referential Theory vs. Semiotic Triangle Refined Coconut Oil vs. Unrefined Coconut Oil Refined Grains vs. Whole Grains Refined vs. Tailored Reflect vs. Resonate Reflection vs. Refraction Reflection vs. Scattering Reflection vs. Total Internal Reflection Reflection vs. Understanding Reflectively vs. Reflexively Reflector Telescopes vs. Refractor Telescopes Reflexivity vs. Transitivity Reflux vs. Soxhlet Extraction Reform Party vs. Tory Party Reform vs. Revolution Reform vs. Transform Reformation vs. Renaissance Refraction vs. Total Internal Reflection Refrain vs. Restrain Refurbished vs. Used Refuse vs. Reject Refutable vs. Reputable Refuting a Hypothesis vs. Rejecting a Hypothesis Regeneration of Vapor Cycle vs. Reheating of Vapor Cycle Regeneration vs. Reheating Regeneration vs. Replacement Regeneration vs. Reproduction Regenerative Agriculture vs. Sustainable Agriculture Regenerative Medicine vs. Tissue Engineering Reggae vs. Reggae-Rock Reggae vs. Ska Reggio Emilia vs. Reggio Emilia Inspired Regime vs. Rule Regional Companies vs. Transnational Companies Regional Cooperation vs. Regional Integration Regional Enterprise vs. Transnational Enterprise Regional Integration vs. Regionalism Regionalism vs. Regionalization Regioselectivity vs. Stereoselectivity Registered Designs vs. Unregistered Designs Registered Trademark vs. TM Registrar vs. Registrars Registrar vs. Registry Registration in Hotel vs. Reservation Regression Testing vs. Retesting Regression Testing vs. Sanity Testing Regression vs. Reincarnation Regret vs. Remorse Regret vs. Repentance Regret vs. Sorry Regrettable vs. Unfortunate Regular Fit vs. Slim Fit Regular Flu vs. Swine Flu Regular Oil vs. Synthetic Oil Regulate vs. Rule Regulated Power Supply vs. Unregulated Power Supply Regulation vs. Standard Regulation vs. Statute Regulations vs. Requirements Regulations vs. Rules Regulations vs. Statute Regulatory Genes vs. Structural Genes Regulatory Protein vs. Repressor Protein Regulus Black vs. Sirius Black Regurgitation vs. Stenosis Regurgitation vs. Vomiting Rehabilitation vs. Repair Rehabilitation vs. Retrofit Reheating Furnace vs. Soaking Furnace Reign vs. Rein Reign vs. Rule Reigns vs. Reins Reiki End Plates vs. Standard End Plates on a Massage Table Reincarnation vs. Transmigration Reindeer vs. Snowy Owl Reinforcement Learning vs. Supervised Learning Reiteration vs. Repetition Related Literature vs. Related Studies Related vs. Relative Relation vs. Relationship Relational Capital vs. Structural Capital Relational Context vs. Relationship Relational Selling vs. Transactional Selling Relationship Marketing vs. Transactional Marketing Relationship vs. Situationship Relationship vs. Support System Relationship vs. Task Relative Clause vs. Subordinate Clause Relative Density vs. Specific Gravity Relative Humidity vs. Vapor Pressure Deficit Relative Velocity vs. Velocity Relativity vs. Special Relativity Relaxed vs. Skinny Relay Attack vs. Replay Attack Release Train Engineer vs. SAFe Practice Constant Release Train Engineer vs. SAFe Practice Consultant Release vs. Rollout Relentless vs. Resilience Relevant Cost vs. Sunk Cost Reliability vs. Validity Relief Valve vs. Safety Valve Religion vs. Science Religion vs. Spiritual Religion vs. Spirituality Religion vs. Superstition Religion vs. Theology Religion vs. Theosophy Religion vs. Tradition Religion vs. Trust Religions vs. Science Religious Explanation of the Universe vs. Scientific Explanation of the Universe Religious Literature vs. Secular Literature Religious Rituals vs. Secular Rituals Religious Studies vs. Theology Religious vs. Spiritual Reltio MDM vs. SAP MDM Reltio MDM vs. Stibo MDM Remain vs. Stay Remake vs. Transform Remark vs. Remedy Remarkably vs. Unusually Remaster vs. Rerecord Remeasurement vs. Translation Remedy vs. Therapy Remedy vs. Treatment Remember vs. Remind Remit vs. Return Remodeling vs. Renovation Remote-Access Trojan vs. Trojan Remote Assistance vs. Remote Desktop Remote Desktop vs. VNC Remote Team vs. Virtual Team Remove vs. Suppress Remuneration vs. Salary Remuneration vs. Wage Remux vs. UHD Renaissance Literature vs. Romantic Literature Renal Cortex vs. Renal Medulla Renin vs. Rennin Renminbi vs. Yuan Renovation vs. Restoration Reorder Level vs. Reorder Quantity Repealed vs. Repudiated Repeatability vs. Reproducibility Repetitive DNA vs. Satellite DNA Rephrasing vs. Reword Replica Jerseys vs. Swingman Jerseys Replicant vs. Robot Replication Bubble vs. Replication Fork Replication vs. Transcription Reply vs. Retweet Repo Rate vs. Reverse Repo Rate Report vs. Review Report vs. Thesis Reporter Gene vs. Selectable Marker Reporting vs. Writing Repose vs. Respite Representation vs. Warranty Representations vs. Terms Representative Elements vs. Transition Elements Representative vs. Senator Repress vs. Suppress Repression vs. Suppression Reproductive Cloning vs. Somatic Cloning Reproductive Cloning vs. Therapeutic Cloning Reps vs. Sets Reptile vs. Scorpion Reptile vs. Sub-Zero Republic of China vs. The People's Republic of China Republic of Serbia vs. Republika Srpska Republic vs. Republican Republic vs. Theocracy Republican Rome vs. United States Republicans vs. Tea Party Republicans vs. Tory Republicans vs. Unionists Repudiated vs. Revoked Repugnant vs. Unyielding Reputation vs. Repute Request Method vs. Response Method Request vs. Response Request vs. Yes Required vs. Requisite Requirement vs. Specification Rer vs. Rq RER vs. SER Research Article vs. Research Paper Research Article vs. Review Article Research Design vs. Research Method Research Design vs. Research Methodology Research Design vs. Research Methods Research Design vs. Strategy of Inquiry Research Gap vs. Research Recommendation Research Method vs. Scientific Method Research Methodology vs. Research Methods Research Methods vs. Scientific Method Research Methods vs. Scientific Methods Research Problem vs. Research Question Research Proposal vs. Research Report Research vs. Scientific Method Research vs. Scientific Research Research vs. Search Research vs. Study Research vs. Theory Researcher vs. Scientist Reserves vs. Retained Earnings Residence vs. Unit House Resident vs. Tenant Residential House vs. Unit House Resin vs. Rosin Resistance Training vs. Weightlifting Resistance vs. Resistivity Resistance vs. Resistor Reskilling vs. Upskilling Resolve vs. Solve Resource Based View vs. V-I-R-O Resource Conservation vs. Sustainable Development Resource vs. Source Resources vs. Solutions Resources vs. Sources Respect for Others vs. Respect for Self Respect vs. Self-Respect Respect vs. Support Respected vs. Respectful Respiration in Animals vs. Respiration in Plants Respiration vs. Ventilation Respirator vs. Ventilator Respiratory Bronchioles vs. Terminal Bronchioles Respiratory System vs. Urinary System Respond vs. Response Response Redirect vs. Server Transfer Response vs. Responses Response vs. Stimulus Responsibilities vs. Rights Responsibilities vs. Task Responsibility vs. Role REST Protocol vs. SOAP Protocol Rest vs. Rested Rest vs. Sleep Restenosis vs. Stent Thrombosis Restless vs. Tranquil Restorative Justice vs. Retributive Justice Restricted Free Agent vs. Unrestricted Free Agent Restroom vs. Washroom Retail vs. Wholesale Retaliation vs. Retribution Retin-A vs. Retinol Retinoid vs. Retinol Retinol vs. Retinyl Retinol vs. Retinyl Palmitate Retinol vs. Tretinoin Retired Conservative vs. Retired NDP Retractile Testis vs. Undescended Testis Retribution vs. Revenge Retro vs. Vintage Retrosynthesis vs. Synthesis Retrotransposon vs. Transposon Retrovirus vs. Virus Return on Capital vs. Return on Equity Return on Equity vs. Return on Total Capital Return vs. Yield Revalidation vs. Validation Revelation Comics vs. The Christ Comics Revenge vs. Tragedy Revenge vs. Vengeance Revenge vs. Vindictive Revenue vs. Sales Revenue vs. Turnover Reverence vs. Veneration Reverse Osmosis vs. Ultrafiltration Reverse Proxy vs. Source NAT Reverse Transcription vs. Transcription Reverse vs. Revise Reversion Mutation vs. Suppression Mutation Reversion vs. True Reversion Review vs. Revise Revolution of 1830 vs. Revolution of 1848 Revolution vs. Rotation Revolution vs. Transformation Revolutionizing vs. Transmuting Reword vs. Rewrite Reye's Syndrome vs. Rheumatic Disease RFI vs. RFP RFI vs. RFQ RFLP vs. Rapid RFLP vs. SNP RFP vs. RFQ RFP vs. Tender RFQ vs. Tender Rhabdomyolysis vs. Viral Mediated Myositis Rhea vs. Tapir Rheme vs. Theme Rheology vs. Viscosity Rheopectic Fluids vs. Thixotropic Fluids Rhesus Monkey vs. Uakari Rhetoric vs. Speech Communication Rheumatic Disease vs. Rheumatic Fever Rheumatic Fever vs. Rheumatic Heart Disease Rheumatic Fever vs. Scarlet Fever Rheumatoid Arthritis vs. Septic Arthritis Rhinitis vs. Rhinosinusitis Rhinitis vs. Sinusitis Rhinitis vs. Tonsillitis Rhino vs. Rose Rhinosinusitis vs. Sinusitis Rhizoids vs. Rhizomes Rhizome vs. Stolon Rhizome vs. Tuber Rho Factor vs. Sigma Factor Rhodium vs. Ruthenium Rhombus vs. Square Rhombus vs. Trapezoid Rhyme vs. Rhythm Rhyme vs. Rime Rhythm vs. Tempo Ri Plasmid vs. Ti Riboflavin vs. Thiamin Ribose vs. Ribulose Ribosomes vs. rRNA Ribosomes vs. Spliceosomes Ribs vs. Spare Ribs Rice Flour vs. Wheat Flour Rice Vinegar vs. Rice Wine Vinegar Rice Vinegar vs. White Vinegar Rice vs. Wheat Rich Hug Bank vs. Service Dog Handler Rich vs. Wealthy Richardsonian Romanesque vs. Romanesque Richter Scale vs. Rosse Forel Scale Rico Tubbs vs. Sonny Crockett Ride vs. Voyage Ridgeline vs. Tacoma Rifabutin vs. Rifampicin Rifampicin vs. Rifampin Right Angle Triangle vs. Square Right Answer vs. Wrong Answer Right Now vs. Today Right of Lien vs. Stoppage-in-Transit Right to Assembly Freedom in South Africa vs. The South African Constitutional Duty to Maintain Public Order and Safety Right vs. Rite Right vs. Straight Right vs. Wrong Righteousness vs. Wickedness Rigid Separation of Power vs. Strict Separation of Powers Riley Hale vs. Vic Deakins Rill vs. Rivulets Rill vs. Runnels Rimowa vs. Samsonite Rimowa Wheels vs. Samsonite Wheels Ring Topology vs. Star Topology Ring vs. Rink Ring vs. Sound Rinnegan vs. Six Paths Sage Mode Rinnegan vs. Yin-Yang Release Rio de Janeiro vs. Sao Paulo Riptide Water Based ULV vs. Summit Mosquito and Gnat Barrier Rise vs. Soar Rise vs. Sunrise Risk Analysis vs. Risk Identification Risk Appetite vs. Risk Tolerance Risk Assessment vs. Site Risk Assessment Risk Matrix vs. Risk Register Risk of Rain 2 vs. Team Fortress 2 Risk vs. Risks Risk vs. Risky Risk vs. Threat Risk vs. Treat Risk vs. Uncertainty Risk vs. Vulnerability Ritalin vs. Vyvanse Rite vs. Ritual Ritual vs. Tradition Rituals vs. Science River Rafting vs. White Water Rafting River vs. Spring River vs. Stream Riverdale vs. Twin Peaks Rivers vs. Seas Rivulets vs. Runnels Rizz vs. Sigma RJ11 vs. RJ45 Rm vs. Sm RM vs. SMS RMI vs. RPC RNA-Seq vs. Seq Data RNA Sequencing vs. Transcriptomic Analysis RNA Viruses vs. Retroviruses RNA vs. mRNA RNase A vs. RNase H Roaches vs. Water Bugs Road Bike vs. Triathlon Bike Road Rules vs. The Real World Road vs. Roe Road vs. Street Road vs. Way Roadmap vs. Strategy Roast vs. Steak Roast vs. Toast Rob vs. Steal Robbery vs. Theft Robert Welch vs. Stanley Morgan Robert Welch vs. Stanley Rogers Roblox Doors vs. Roblox Piggy Roboreptile vs. Robotyrannus Robot vs. Searle's Chinese Room Argument Robust vs. Strong ROCE vs. ROE ROCE vs. ROIC Rock and Roll vs. Rockabilly Rock 'n' Roll vs. Rockabilly Rock Salt vs. Sea Salt Rock vs. Rock 'n' Roll Rock vs. Soil Rock vs. Stone Rock vs. Suicune Rocket vs. Violin Rocks vs. Stones Rockwell Automation vs. Rockwell Collins Roentgen vs. Sievert Roger Staubach vs. Terry Bradshaw Rohit vs. Virat ROI vs. Road R/OKBuddyPersona vs. Social Interaction Roku Express vs. Roku Streaming Stick Rolaids vs. Tums Roland Garros vs. US Open Role Conflict vs. Role Strain Role Presentation vs. Rotenone Role vs. Roll Role vs. Status Roller Derby vs. Roller Skating Rolling Budget vs. Traditional Budget Rolling Forecasts vs. Traditional Budgeting Rolling Friction vs. Sliding Rollover IRA vs. Roth IRA ROM vs. Ram Roma Tomatoes vs. Truss Tomatoes Roman Arches Techniques Main Features and Material vs. Roman Domes Techniques Main Features and Material Roman Arches Techniques Main Features and Material vs. Roman Vaults Techniques Main Features and Material Roman Arches vs. Roman Vaults Romanesque Architecture vs. Tudor Architecture Romani vs. Romanian Romania Tourist vs. Romania Visit Romanian Deadlift vs. Stiff-Leg Deadlift Romantic Literature vs. Victorian Literature Romantic Poetry vs. Victorian Poetry Romantic Themes vs. Sexual Themes Romantic vs. Sexual Romanticism vs. Socialism Romanticism vs. Surrealism Romanticism vs. Transcendentalism Romeo and Juliet vs. The Merchant of Venice Ronaldinho vs. Ronaldo Room vs. Space Room vs. Suite Roosevelt vs. Stalin Roosevelt vs. Taft Roosevelt vs. Wilson Root Beer vs. Root Beer Float Root Beer vs. Sarsaparilla Root Beer vs. Sprite Root Cause Analysis vs. Run Chart Root Hair vs. Stamen Hair Root Pressure vs. Transpiration Pull Root vs. Shoot Apical Meristem Root vs. Stem Rootdelay vs. Rootwait Rooted Phylogenetic Tree vs. Unrooted Phylogenetic Tree Roots vs. Stems Roots vs. Zeroes Rootstock vs. Scion Rory vs. Rosie Rosario Dawson vs. Zoe Saldana Rose vs. Rosemary Rosevear Software's Handy vs. Rosevear Software's SAM Rosevear Software's Real SAM Shell vs. Rosevear Software's Synthetic SAM Shell Rosevear Software's SAM Libraries vs. Traditional Code Libraries Rotary vs. Roundabout Rotational Spectroscopy vs. Vibrational Spectroscopy Roth 401(k) vs. Roth IRA Roth 401(k) vs. Traditional 401(k) Roth IRA vs. Traditional IRA Rough Collie vs. Shetland Sheepdog Rough Copper Atoms vs. Smooth Copper Atoms Rough Endoplasmic Reticulum vs. Smooth Endoplasmic Reticulum Rough ER vs. Smooth ER Round vs. Spherical Round vs. Strips Roundworm vs. Tapeworm Rousseau vs. Wordsworth Route vs. Trace Route vs. Traceroute Router on a Stick vs. VLAN Router Router vs. Switch Routing Loop vs. Switching Loop Routing Numbers vs. SWIFT Code Rowan Hashiba vs. Roy Sanada Rowan Hashiba vs. Ryo Sanada Rowing vs. Sailing Rowing vs. Sculling Royal Flush vs. Straight Flush Royal Rumble vs. WrestleMania Royalty Interest vs. Working Interest RPG vs. RPG RPM vs. Yum RPO vs. RTO RPR vs. VDRL RRSP vs. RSP RRSP vs. TFSA RS232 vs. RS485 RSA vs. SHA-1 RSI vs. RSSI RSRP vs. SNR RSS vs. RSS2 RSSI vs. SSID RST vs. SYN Rsync -a vs. Rsync -ax Rsync -av vs. Rsync -avi Rsync -av vs. Rsync -avn Rsync -av vs. Rsync -avx RT-PCR vs. qPCR RT-PCR vs. RT-qPCR RTD vs. Thermocouple RTGS vs. Swift RTV Silicone vs. Silicone RTX 2060 vs. RTX 3060 RTX 3050 vs. RTX 3060 Rubber vs. Silicone Rubbing Alcohol vs. Surgical Spirit Rubella Neonatal Syndrome vs. Varicella Neonatal Syndrome Rubella vs. Rubeola Rubicon vs. Wrangler Rugby 7s vs. Rugby Union Rugby League vs. Rugby Union Rugby vs. UK Football Rugged vs. Twink Ruin vs. Undermine Ruin vs. Waste Rule in Foss v Harbottle vs. Section 212 of the Companies Act 2014 Ruler vs. Scale Rules vs. Standards Rules vs. Values Rum vs. Whiskey Run Dev vs. SST Dev Run-On vs. Sentence Fragment Run The Jewels 2 vs. Run The Jewels 3 Runlevel 2 vs. Runlevel 3 Runlevel 3 vs. Runlevel 4 Runnable vs. Thread Running Shoes vs. Training Shoes Running vs. Skiing Running vs. Swimming Running vs. Walking Runway Fashion Model vs. Street Fashion Model Rup vs. Waterfall Methodology Rural Area vs. Urban Area Rural Areas vs. Urban Areas Rural Communities vs. Urban Communities Rural Ecological Succession vs. Urban Ecological Succession Rural Sociology vs. Urban Sociology Rural vs. Urban Rurals vs. Urbans Russia vs. Soviet Union Russia vs. Ukraine Russia vs. United States of America Russia vs. US Russia vs. USA Russia vs. USSR Russia vs. Vatican City Russia vs. World Conflict Russian Conservatives vs. Russian Liberals Russian Dressing vs. Thousand Island Dressing Russian Quality of Life and Infrastructure vs. Soviet Quality of Life and Infrastructure Russian Scientific Texts vs. Western Scientific Texts Rust Converter vs. Rust Remover Rust vs. Smut Rust vs. Unturned Rust vs. Zig Rutabaga vs. Turnip Rutherford Atomic Theory vs. Thomson Atomic Theory Rutherford Model of Atom vs. Thomson Model of Atom Rutherford's Atomic Model vs. Thomson's Atomic Model Rutherford's Atomic Theory vs. Thomson's Atomic Theory Rx-7 vs. Rx-8 Ryan Gosling vs. Ryan Reynolds Ryan vs. Skyler Rye Whiskey vs. Whiskey Ryerson University vs. York University Rylands vs. Trespass to Land Ryo Sanada vs. Sage Date Ryuo vs. Yugi