| Komparation | comparison |
| Komparativ | comparative |
| Komparator | comparator |
| Kooperation | cooperation co-operation |
| Komposition | composition |
| Kombination | combination |
| Kommutation | substitution test |
| Kompensation | compensation |
| Komplikation | complication |
| Präparation | dissection |
| Reparation | reparation |
| Separation | separation |
| Konspiration | conspiracy |
| Operation | surgery operation |
| Kooptation | co-optation co-option |
| Kopulation | copulation |
| Kompilator | compiler |
| Kommemoration | commemoration |
| Kompagnon | partner |
| Komparatistik | comparative linguistics |