| Kollektor | collector |
| Kollekte | offertory |
| Kollektion | collection |
| Kollektiv | collective |
| kollektiv | collective |
| Korrektor | proofreader |
| Rollator | walker walking frame rollator Zimmer frame |
| Kellertür | cellar door |
| Elektor | elector |
| Reflektor | reflector |
| Deflektor | deflector |
| Lektor | lector reader lecturer literary editor |
| Selektor | selector |
| Konjektur | conjecture |
| Korrektur | correction |
| Kolbenmotor | piston engine |
| Kolektomie | colectomy |
| kollegial | collegial |
| kollern | gobble |
| kollinear | collinear |