| Konfusion | bewilderment |
| Konfession | denomination |
| Konklusion | conclusion |
| Konkussion | concussion |
| Konvulsion | convulsion |
| Infusion | infusion |
| Kernfusion | nuclear fusion |
| Kollusion | collusion |
| Konduktion | conduction |
| Konfucius | Confucius |
| Konfuzius | Confucius |
| Konsumtion | consumption |
| Kontorsion | contortion |
| konfus | confused |
| konfuse | confuse |
| Kondition | condition |
| Konfektion | make manufacture ready-to-wear off-the-peg clothing off-the-rack clothing clothing industry |
| Konversion | conversion |
| Konzession | concession admission licence |
| Diffusion | diffusion |