| Koloratur | coloratura |
| Kolporteur | colporter colporteur |
| Kontraktur | contracture |
| Kolkrabe | common raven |
| Kollaborateur | collaborator |
| Kollektor | collector |
| Koloman | Colman |
| Kolorismus | colorism |
| Kolosseum | Colosseum |
| Kolabaum | kola kola nut tree |
| Kollar | collar |
| Kolonisator | colonizer |
| Kolosser | Colossian Colossians |
| Kolostrum | colostrum beestings foremilk |
| Kolter | doona |
| Solofrau | single |
| Colorado | Colorado |
| Volontär | volunteer |
| Chlorat | chlorate |
| Decorator | decorator pattern |