| Operator | operator administrator |
| Operation | surgery operation |
| operativ | surgical operative operational strategic |
| Imperator | emperor |
| Iterator | iterator |
| Moderator | moderator host master of ceremonies |
| Prätor | praetor |
| Operette | operetta |
| operabel | operable |
| Superatom | superatom |
| Apertur | aperture |
| spermato- | spermato- |
| Moderato | moderato |
| moderato | moderato |
| Berater | consultant adviser advisor |
| Erato | Erato |
| Generator | generator |
| Gyrator | gyrator |
| Komparator | comparator |
| Kurator | curator |