- uvulopalatopharyngoplasty
- uranoplasty
- UPPP
- unpaid
- unskilled
- Upupa
- Uria
- Upupidae
- unredeemed
- unsafe
- uneager
- univalve
- upbraiding
- UTC
- upset
- unusual person
- unseeing
- universal time
- universalism
- unrestrained
- unprofitableness
- unprofitability
- unprofitably
- United States liquid unit
- unchivalrously
- unfairness
- united states government accounting office
- undress
- underframe
- unconnected
- US Border Patrol
- US Army
- United States Border Patrol
- US Fish and Wildlife Service
- US Government Printing Office
- United States Government Printing Office
- United States Navy
- USCB
- USA
- United States Air Force
- US Air Force
- United States Army
- United States Coast Guard
- United States Public Health Service
- United States Fish and Wildlife Service
- US Navy
- US Coast Guard
- unreality
- untruthfulness
- unicameral script