| Kataklysmus | cataclysm |
| Katabolismus | catabolism |
| Fatalismus | fatalism |
| Katalyse | catalysis |
| Katechismus | catechism |
| Atavismus | atavism |
| Satanismus | Satanism |
| Kanadismus | Canadianism |
| Kausalismus | causalism |
| Kemalismus | Kemalism |
| Kapitalismus | capitalism |
| Vitalismus | vitalism |
| Katakombe | catacomb |
| Katalysator | catalyst catalyzer catalytic converter |
| Katholizismus | Catholicism |
| katathym | katathym |
| Anaklasis | anaclasis |
| Analysis | analysis mathematical analysis calculus |
| Paroxysmus | paroxysm |
| Aktualismus | actualism |