| Koadaptation | coadaptation |
| Adaptation | adaptation |
| Kooptation | co-optation co-option |
| Koagulation | coagulation |
| Adaption | adaptation |
| Konsultation | consultation |
| Kapazitation | capacitation |
| Kavitation | cavitation |
| Kohabitation | cohabitation |
| Kommutation | substitution test |
| Konnotation | connotation |
| Koedukation | coeducation |
| Kondensation | condensation |
| Komparation | comparison |
| Koalition | coalition |
| Prädation | predation |
| Annotation | annotation |
| Bahnstation | railway station |
| Implantation | implantation |
| Okkultation | occultation |