| Korrosion | corrosion |
| Korsin | Corsican |
| Korruption | corruption |
| Kortison | cortisone |
| Erosion | erosion |
| Kerosin | kerosene |
| Kontorsion | contortion |
| Kohäsion | cohesion |
| Kollision | collision |
| Kollusion | collusion |
| Konfusion | bewilderment |
| Torsion | torsion |
| Korfiotin | Corfiot |
| Korrektor | proofreader |
| korrodieren | corrode |
| Kordon | cordon |
| Korfiot | Corfiot |
| Kormoran | cormorant Great Cormorant |
| Korrelation | correlation association |
| Korridor | corridor |