- U. S. Coast Guard
- United States Marshals Service
- united states attorney general
- united states cabinet
- United States Trade Representative
- United States Postal Service
- United States Postal Inspection Service
- united states
- u.s.
- united states of america
- u.s.a.
- united states air force academy
- united states code
- united states army criminal investigation laboratory
- Union Army
- upper bound
- unfenced
- unknotted
- unveiled
- unsheathed
- unpretentiousness
- unostentatious
- uncouthness
- undersign
- unfed
- unfeeling dry behaviour
- unfeeling heart
- unheated
- under another's sway
- untidiness
- unremedied
- unsuitable
- under pressure
- underfelt
- unmeaning
- unstressed
- unhealthfulness
- unfavourableness
- unrefined powdered sugar
- unopen
- under lock and key
- untrod
- untreated
- unerringly
- undiscovered
- untraceable
- unleash
- unpurified
- unsold
- unsharpened