| Katholik | Catholic |
| Katholikin | Roman Catholic Catholic |
| Katholikos | catholicos |
| Katholin | papist |
| Kathole | papist |
| Katholikentum | catholicity |
| Altkatholik | Roman Catholic |
| Kätzli | kitten |
| Kathode | cathode |
| katholisch | catholic Catholic |
| Mathetik | mathetics |
| Kantholz | squared timber |
| Methodik | methodology method |
| Acholie | acholia |
| Kaolin | kaolin |
| Kolik | colic |
| Alt-Katholik | Roman Catholic |
| Katoey | kathoey |
| Katzoff | slaughterer |
| Kätzlein | kitten |