- diving
- diving beetle
- diving bell
- diving board
- unwonted
- unworkable
- unworldly
- unworn
- unworthy
- unwound
- unwrap
- unwritten
- unyielding
- unyoke
- unzip
- un–American
- un–Christian
- un–English
- U of Massachusetts-Stockbridge School of Agricult
- U of New Hampshire-Thompson Sch of Appl Science
- U of Puerto Rico-Ponce Technological Univ College
- U of Texas-Southwestern Medical Center at Dallas
- up
- up
- UP