| Korrektor | proofreader |
| Korrektorat | proofreading |
| Korrektur | correction |
| korrekt | correct |
| korrektiv | corrective |
| Kollektor | collector |
| Korridor | corridor |
| Vorreiter | precursor outrider trailblazer vanguard |
| Direktor | manager director headmaster principal senior vice president |
| Rektor | rector principal |
| Konjektur | conjecture |
| Kernreaktor | nuclear reactor |
| Korrektheit | correctness |
| Korruptel | corruption |
| Koreaner | Korean |
| Kornett | cornet |
| Korrelat | dummy element |
| Korrelation | correlation association |
| Korrepetitor | repetiteur répétiteur |
| Korrosion | corrosion |