| konkav | concave |
| Konkavität | concavity |
| Konkani | Konkani |
| Konklave | conclave |
| Konrad | Conrad |
| bikonkav | biconcave |
| Konche | conche apse |
| Konoid | conoid |
| Kontor | office |
| Könige | Kings |
| Können | competence ability |
| können | can be able to may be allowed to know |
| konfus | confused |
| könnte | might |
| Kokon | cocoon |
| Koncha | apse |
| Kondom | condom rubber |
| Kondor | condor |
| Kongo | Congo Kongo |
| Konkurs | bankruptcy |