| konkordant | concordant |
| Konkordanz | concordance |
| Konkordat | concordat |
| Konkurrent | competitor |
| Konsonant | consonant |
| konkludent | conclusive implied |
| konkomitant | concomitant |
| Akkordant | contractor gaffer governor subcontractor taker |
| Sonorant | sonorant |
| Konformist | conformist |
| Konkrement | calculus |
| Kontraalt | contralto |
| Kontrakt | compact contract |
| Konkani | Konkani |
| Konkurrenz | competition competitor |
| Kontrast | contrast |
| kongruent | congruent |
| konkret | concrete |
| konstant | constant constantly |
| konvergent | convergent |