- um
- urgh
- uh
- ugh
- umm
- uh-oh
- uh-uh
- unberufen
- upadaisy
- uck
- uckfay
- unf
- unh
- unh-uh
- ungh
- uwu
- uff da
- uffda
- uffdah
- urp
- ullo
- umph
- über alles
- Unsupported titles/C through N to K
- uncle
- ulp
- untz
- uh huh
- uh oh
- uh uh
- uh-oh, Spaghetti-O
- uhh
- uhhuh
- unquote
- up top
- uhm
- upsadaisy
- up yours
- ur
- uhu
- uhuh
Note: these words have been obtained from Wiktionary and have been classified and improved through automated computer linguistics processes.