| Kontorsion | contortion |
| Kontorsionist | contortionist |
| Konversion | conversion |
| Konfession | denomination |
| Konfusion | bewilderment |
| Konklusion | conclusion |
| Konkussion | concussion |
| Konvulsion | convulsion |
| Konzession | concession admission licence |
| Kantorin | cantor |
| Plottorsion | plot twist |
| Retorsion | retorsion retortion |
| Torsion | torsion |
| Korrosion | corrosion |
| Konduktion | conduction |
| Konformist | conformist |
| Konkretion | concretion |
| Konsumtion | consumption |
| Konterbier | hair of the dog |
| Kontor | office |