| Kernfusion | nuclear fusion |
| Kernfission | nuclear fission |
| Konfusion | bewilderment |
| Infusion | infusion |
| Kerosin | kerosene |
| Bankenfusion | bank merger |
| Diffusion | diffusion |
| Fusion | fusion merger |
| Transfusion | transfusion |
| Exklusion | exclusion |
| Kollusion | collusion |
| Konklusion | conclusion |
| Erosion | erosion |
| Konfession | denomination |
| Konkussion | concussion |
| Konvulsion | convulsion |
| Korrosion | corrosion |
| Pension | pension |
| Perkussion | percussion |
| Persuasion | persuasion |