| Kongratulation | congratulation |
| Konfabulation | confabulation |
| Gratulation | congratulations gratulation |
| Konkatenation | concatenation |
| Koagulation | coagulation |
| Konsultation | consultation |
| Kontrazeption | contraception |
| Konurbation | conurbation |
| Konfiguration | configuration |
| Konfrontation | confrontation |
| Konjugation | conjugation |
| Konnotation | connotation |
| Konstellation | constellation |
| Konstitution | constitution |
| Kontamination | amalgam blending |
| Kontemplation | contemplation |
| Kontraktion | contraction |
| Kontribution | tribute |
| Konzentration | concentration |
| Gratulantin | congratulator |