| katotherm | katothermal |
| anotherm | anothermal |
| katathym | katathym |
| isotherm | isothermic |
| endotherm | endothermic |
| exotherm | exothermic |
| xerotherm | xerothermic |
| Katzerl | kitten |
| Kataphora | cataphora |
| Katarer | Qatari |
| Kataster | land register cadastre |
| Katechese | catechesis |
| Katechet | catechist |
| Kater | tomcat cat tom hangover |
| Katharer | Cathar |
| Katheder | lectern |
| Kathete | cathetus |
| Katheter | catheter |
| Kätzchen | kitten kitty catkin |
| Atomkern | atomic nucleus atomic core nucleus |