| Katalysator | catalyst catalyzer catalytic converter |
| Biokatalysator | biocatalysator |
| Dialysator | dialyzer |
| Katalyse | catalysis |
| Kataster | land register cadastre |
| Kanalisation | sewage system |
| Kataklysmus | cataclysm |
| Katalane | Catalan |
| Katalanin | Catalan |
| Katalog | catalog catalogue |
| katalytisch | catalytic |
| Fatalist | fatalist |
| Fatalistin | fatalist |
| Natalität | natality |
| Analysand | analysand |
| Analyst | analyst |
| Analystin | analyst |
| Kolonisator | colonizer |
| Kondensator | capacitor |
| Organisator | organizer |