| Konkordanz | concordance |
| konkordant | concordant |
| Konkordat | concordat |
| Konkurrenz | competition competitor |
| Konkurrenz- | competitive |
| Kontratanz | contra |
| Kondolenz | condolence |
| Konferenz | conference |
| Konfidenz | confidence trust |
| Kongruenz | agreement, concord congruity |
| Konkani | Konkani |
| Konkurrent | competitor |
| Konsonant | consonant |
| Konstanz | constancy Constance |
| Konvergenz | convergence |
| Serokonkordanz | seroconcordance |
| konkludent | conclusive implied |
| konkomitant | concomitant |
| Kronkorken | crown cap crown cork |
| Akkordant | contractor gaffer governor subcontractor taker |