| Kaufoption | call option purchase option |
| Kaution | bail deposit |
| Adoption | adoption affiliation |
| Käuferin | buyer |
| Taufpatin | godmother |
| Koptin | Copt |
| Option | option |
| Put-Option | put option |
| Absorption | absorption |
| Adaption | adaptation |
| Adsorption | adsorption |
| Eruption | eruption |
| Konzeption | conception |
| Korruption | corruption |
| Auktion | auction |
| Automation | automation |
| Kassation | cassation abrogation quashing reversal annulment military degradation |
| Kastration | castration |
| Kation | cation |
| Kavitation | cavitation |