| Katholikos | catholicos |
| Katholikin | Roman Catholic Catholic |
| Katholik | Catholic |
| Katholin | papist |
| katholisch | catholic Catholic |
| Kathole | papist |
| Tholos | tholos |
| Kaliko | calico |
| Altkatholik | Roman Catholic |
| Altkatholikin | Roman Catholic |
| Katholikentum | catholicity |
| Katholizität | catholicity |
| Katoblepas | catoblepas |
| Kätzli | kitten |
| Katabolismus | catabolism |
| Katalog | catalog catalogue |
| Katharina | Katherine Catharine Catherin Cathryn Katharine Katharyn |
| Katharsis | catharsis |
| Kathode | cathode |
| Katholizismus | Catholicism |