| Katholikentum | catholicity |
| Katholikin | Roman Catholic Catholic |
| Katholikos | catholicos |
| Katholin | papist |
| Katholizität | catholicity |
| Katholik | Catholic |
| Katholizismus | Catholicism |
| Kathole | papist |
| Katzentür | cat flap |
| katholisieren | Catholicize |
| katholisch | catholic Catholic |
| Bathonium | Bathonian |
| Karolinen | Caroline Islands |
| Gadolinium | gadolinium |
| Banditentum | banditry |
| Heldentum | valiance |
| Mennonitentum | Mennonite |
| Miteigentum | tenancy in common |
| Parasitentum | parasitism |
| Teileigentum | condominium |