| zweifelsohne | undoubtedly unquestionably |
| Zweifeln | dubitation |
| zweifeln | doubt |
| zweifelnd | doubtful |
| Zweifelsfall | case of doubt |
| zweifellos | undoubtedly no doubt doubtless doubtlessly certainly indubitable |
| zweifelsfrei | doubtless |
| Zweiersofa | love seat |
| Zweifel | doubt |
| zweifelhaft | doubtful dubious |
| Enkelsohn | grandson |
| Bezweifeln | dubitation |
| bezweifeln | doubt |
| Zweibeiner | biped |
| Zweifüßer | biped |
| Zweifüßerin | biped |
| Zweifüßler | biped |
| Zweikorn | emmer |
| Zweiphasen- | two-phase |
| Zweiteilung | dichotomy |