| okkasionell | occasional |
| irrationell | irrational |
| rationell | economic |
| Okklusion | occlusion |
| Kastell | castellum castelet castellet |
| professionell | professional |
| funktionell | functional |
| redaktionell | editorial |
| sensationell | sensational |
| Organell | organelle |
| kriminell | criminal |
| offizinell | officinal |
| originell | original inventive fancy |
| Kapitell | capital |
| okkasionelle Bildung | nonce word |
| okkupiert | occupied |
| Okkasionalismus | nonce word nonce |
| Okkupation | occupation |
| okkupieren | occupy |
| Akkadier | Akkadian |