| Kolonie | colony |
| Kolonne | convoy fractionating column |
| Kolonel | minion |
| Kolonist | colonist |
| kolonial | colonial |
| Kolon | colon |
| Ökologie | ecology |
| -ologie | -ology |
| Oologie | oology |
| Arkologie | arcology |
| Kolchis | Colchis |
| Kolloid | colloid |
| Koloman | Colman |
| Ökologin | ecologist |
| Kapkolonie | Cape Colony |
| Kolik | colic |
| Kollege | colleague workmate co-worker |
| Kolonnade | colonnade |
| Koloss | colossus |
| Kolosser | Colossian Colossians |