| Kontraktion | contraction |
| Konstruktion | construction |
| Konduktion | conduction |
| Konkretion | concretion |
| Kontrakt | compact contract |
| Kontrazeption | contraception |
| Konurbation | conurbation |
| Konfektion | make manufacture ready-to-wear off-the-peg clothing off-the-rack clothing clothing industry |
| Konjunktion | conjunction |
| Kontraktur | contracture |
| Kontribution | tribute |
| Abstraktion | abstraction |
| Attraktion | attraction |
| Extraktion | extraction |
| Kastration | castration |
| Subtraktion | subtraction |
| Traktion | traction |
| Interaktion | interaction |
| Konsekration | dedication |
| Konspiration | conspiracy |