| Kolonne | convoy fractionating column |
| Kolonie | colony |
| Kolonel | minion |
| Kolon | colon |
| Kolonnade | colonnade |
| Kolumne | column |
| Koloman | Colman |
| Kolonist | colonist |
| kolonial | colonial |
| Kolben | club mace piston butt spadix flask |
| Kollege | colleague workmate co-worker |
| Koloss | colossus |
| Kolosser | Colossian Colossians |
| Köln | Cologne |
| Kölner | Cologne inhabitant of Cologne native of Cologne |
| Ökologe | ecologist |
| Ökologie | ecology |
| -ologe | -ologist |
| -ologie | -ology |
| Colonel | minion |