| Konkurrenz | competition competitor |
| Konkurrenz- | competitive |
| konkurrenzlos | unrivaled |
| Konkurrent | competitor |
| konkurrenzfähig | competitive |
| Kookkurrenz | co-occurrence |
| Konferenz | conference |
| Konkordanz | concordance |
| Konkurrentin | competitor |
| Konvergenz | convergence |
| Rekurrenz | recurrence |
| Knurren | growl |
| knurren | growl rumble |
| knurrend | snarling |
| Konkrement | calculus |
| Kondolenz | condolence |
| Konfidenz | confidence trust |
| Kongruenz | agreement, concord congruity |
| Konkubine | concubine |
| Konkupiszenz | concupiscence |