| Katechese | catechesis |
| Katachrese | catachresis |
| Katechet | catechist |
| Katechetin | catechist |
| Katechumene | catechumen |
| Kathete | cathetus |
| Kätzchen | kitten kitty catkin |
| Katchina | kachina |
| Kathole | papist |
| Katalexe | catalexis |
| Katalyse | catalysis |
| Katechismus | catechism |
| Kategorie | category |
| Katheder | lectern |
| Katheter | catheter |
| Kathode | cathode |
| Katschi | catapult flip ging kattie shanghai slingshot |
| katotherm | katothermal |
| Väterchen | old man |
| Kratersee | crater lake |