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U-69 vs. U-796 U-Boat vs. Viking Boat UAE vs. USA Uber Black vs. UberX Uber Select vs. UberX UberGo vs. UberX UberPool vs. UberX UberSUV vs. UberXL UberX vs. UberXL Ubiquinol vs. Ubiquinone Ubiquiti Dream Machine vs. Ubiquiti U6 Ubuntu 10.10 vs. Ubuntu 11.04 Ubuntu GUI vs. Windows GUI Ubuntu Touch Focal vs. Ubuntu Touch Xenial UCL vs. USL UFC vs. WWE UFC Women vs. WWE Women Ugg Ultimate Boots vs. Ugg Ultra Boots UHF vs. VHF UHMWPE 1000 vs. UHMWPE 800 UI Design vs. UX Design UI vs. UIUC UI vs. UX UK Banger Racing vs. US Banger Racing UK Cluedo vs. USA Clue UK Plug vs. US Plug UK School System vs. US School System UK vs. US UK vs. USA UK vs. Vietnam Ukrainian People's Republic vs. Ukrainian State Ultimate vs. Ultimately Ultimate vs. Ultra Ultimate vs. Utter Ultimately Hot vs. Ultra Hot Ultimately vs. Ultra Ultimately vs. Virtually Ultra Facial Barrier Balm vs. Ultra Facial Cream Ultra Facial Cream vs. Ultra Facial Oil-Free Gel Ultra Hot vs. Utterly Hot Ultra vs. Utter Ultra vs. Utterly UMTS Network Technology vs. WCDMA Network Technology UN General Assembly vs. UN Security Council UN vs. WTO Unbeknownst vs. Unknown Uncertain vs. Unclear Uncredited Checks vs. Unpresented Cheques Underemployment vs. Unemployment Underestimate vs. Underplay Understand vs. Understanding Understanding vs. Wisdom Undeserved vs. Undeserving Unemployed vs. Working Unfair Dismissal vs. Wrongful Dismissal Unfounded vs. Unsupported Ungodliness vs. Unrighteousness Unified Process vs. Waterfall Model Uniformity vs. Unity Unify vs. Unite Unify vs. Unity Union City vs. West New York Union vs. Union All Unit Cost vs. Unit Price Unite vs. Unity United Kingdom vs. United States United States of America vs. Vatican City United States Secretary of Commerce vs. United States Trade Representative Unity of Command vs. Unity of Direction Unity vs. Variety Universal Championship vs. WWE Championship Universal Life vs. Whole Life Universal Pictures vs. Walt Disney Pictures Universal Studios vs. Walt Disney Studios Universal vs. Wisdom Universe vs. World University Chair vs. Vice Chancellor University of Portsmouth vs. University of Sunderland University of Toronto vs. York University University vs. Work Unix FFS vs. Windows NTFS Unix File System vs. Windows File System Unix Variants File System vs. Windows File System Unkind vs. Unsafe Unless vs. Until Unnerve vs. Unsettle Unskimmed Milk vs. Whole Milk UNSW vs. USYD Until vs. Up to Unusual vs. Very Unvoiced Plosives vs. Voiced Plosives Unweighted GPA vs. Weighted GPA Unwritten Constitution vs. Written Constitution Unwritten Laws vs. Written Law Up vs. Upon Upanishads vs. Vedas Update vs. Upgrade Update vs. Upkeep UPVC vs. Vinyl Upward vs. Upwards Uranium 235 vs. Uranium 238 Urea vs. Uric Acid Urea vs. Urine Ureaplasma parvum vs. Ureaplasma urealyticum Ureter vs. Urethra Ureter vs. Uterus Urethra vs. Vas Deferens Urethral Strictures vs. Urolithiasis URI vs. URL Urinalysis vs. Urine Culture Urinalysis vs. Urine Dipstick Urinary Incontinence vs. Urinary Retention Urobilin vs. Urobilinogen U.S. Army vs. U.S. Marines U.S. Citizen vs. U.S. National U.S. Congress vs. UK Parliament U.S. Democratic Party vs. U.S. Republican Party US Patent Litigation Attorney Hourly Fee vs. US Patent Prosecution Attorney Hourly Fee U.S. Political Parties vs. UK Political Parties US Scott Catalogue 733 vs. US Scott Catalogue 753 US vs. USA US vs. USSR Us vs. We USA Democrats vs. USA Republicans USA vs. United States Usable vs. Useful Usage vs. Use USB 1.0 vs. USB 2.0 USB 2.0 vs. USB 3.0 USB 3.0 vs. USB-C USB 3.1 vs. USB 3.2 USB vs. USB-C USBDeview vs. USBView Use Case vs. User Story Use vs. Used Use vs. Utilize Used To vs. Used to Used To vs. Would Used vs. Usual Uterus vs. Vagina Uterus vs. Womb UTI vs. Yeast Infection Utilitarian vs. Utopian Utilitarianism vs. Virtue Ethics Utilitarianism vs. Virtue Theory UTS vs. Young's Modulus UV Spectrophotometer vs. Visible Spectrophotometer UVA Rays vs. UVB Rays UVA vs. UVB UX Design vs. Web Design UX/UI Design vs. Website Optimization