| Katholikin | Roman Catholic Catholic |
| Katholikos | catholicos |
| Katholin | papist |
| Katholik | Catholic |
| Altkatholikin | Roman Catholic |
| katholisch | catholic Catholic |
| Alt-Katholikin | Roman Catholic |
| Katharerin | Cathar |
| Kathole | papist |
| Katholikentum | catholicity |
| Katholizität | catholicity |
| Kätzlein | kitten |
| katholisieren | Catholicize |
| Katalanin | Catalan |
| Athletin | athlete |
| Pathologie | patology pathology |
| Mythologin | mythologist mythologer |
| Kaolinit | kaolinite |
| Karolinen | Caroline Islands |
| Kaolin | kaolin |