| Konkordat | concordat |
| konkordant | concordant |
| Konkordanz | concordance |
| konkret | concrete |
| Golkonda | Golconda |
| Konformist | conformist |
| Konkavität | concavity |
| Konoid | conoid |
| Kontor | office |
| Kontraalt | contralto |
| Kontrakt | compact contract |
| Konvertit | convert |
| Kondensat | condensate |
| Kondor | condor |
| Konformität | conformity |
| Konizität | conicity |
| Konkurrent | competitor |
| Konkurs | bankruptcy |
| Konrad | Conrad |
| Konsonant | consonant |