| Katharerin | Cathar |
| Katarerin | Qatari |
| Katharer | Cathar |
| Karthagerin | Carthaginian |
| Katarer | Qatari |
| Katharina | Katherine Catharine Catherin Cathryn Katharine Katharyn |
| Katharsis | catharsis |
| Athenerin | Athenian |
| Karerin | Carian |
| Mährerin | Moravian |
| Fahrerin | driver |
| Kantianerin | Kantian |
| Katarr | catarrh |
| Katechetin | catechist |
| Kathareuusa | Katharevousa |
| Katharevusa | Katharevousa |
| Katholikin | Roman Catholic Catholic |
| Katholin | papist |
| Kätzlein | kitten |
| Katalanin | Catalan |