| Colchicin | colchicine |
| Coachin | coach |
| Coelestin | celestine |
| Kolchis | Colchis |
| Falchion | falchion |
| Kuschitin | Cushite |
| Chinin | quinine |
| Chitin | chitin |
| Coaching | coaching grooming mentoring teaching |
| Köchin | cook cookeress |
| Lochien | lochia |
| conchieren | conche |
| Allicin | allicin |
| Capsaicin | capsaicin |
| Colemanit | colemanite |
| Collier | necklace |
| Collie | collie |
| Coltan | coltan |
| Columbia | Columbia |
| Dolch | dagger dirk |