| Kommutation | substitution test |
| kommutativ | commutative |
| Kombination | combination |
| Kommunikation | communication |
| Kommunion | Communion |
| Komparation | comparison |
| komputativ | computational computative |
| Mutation | mutation |
| Permutation | permutation |
| Amputation | amputation |
| Konsultation | consultation |
| Konnotation | connotation |
| Kooptation | co-optation co-option |
| Koedukation | coeducation |
| Koagulation | coagulation |
| Konjugation | conjugation |
| Kopulation | copulation |
| Kommentator | commentator |
| Komposition | composition |
| Akkommodation | accommodation |