| operativ | surgical operative operational strategic |
| kooperativ | cooperative |
| Operation | surgery operation |
| Operator | operator administrator |
| Imperativ | imperative |
| imperativ | imperative |
| Iterativ | frequentative |
| iterativ | iterative |
| Optativ | optative optative mood |
| Kooperative | cooperative |
| Operette | operetta |
| operabel | operable |
| präoperativ | preoperative |
| Aperitif | aperitif apéritif |
| Superlativ | superlative |
| hyperaktiv | hyperactive |
| pervasiv | pervasive |
| überaktiv | hyperactive |
| Keratin | keratin |
| Komparativ | comparative |