| Unterwasser- | undersea |
| Unterwasser-Reise | underway |
| unter Wasser | underwater |
| Unterwasser-Rugby | underwater rugby |
| Unterlassen | omission |
| unterlassen | stop |
| Untertasse | saucer |
| Unterhalter | entertainer |
| Unterwasserboot | submarine |
| Unterwerk | substation |
| Unterklasse | subclass |
| Unterlassung | omission |
| Unterwäsche | underwear underclothes underclothing undergarments |
| unterdessen | in the meantime meanwhile |
| untermauern | shore up underpin corroborate substantiate |
| unterweisen | educate |
| Entermesser | cutlass |
| Alsterwasser | shandy |
| verwässert | anodyne |
| Feuerwasser | firewater |