| Karolinger | Carolingian |
| Karolinen | Caroline Islands |
| Karabiner | carabiner |
| Karabinier | carabinier |
| Caroline | Caroline |
| Waiblinger | Ghibelline |
| Haflinger | Haflinger |
| Hardliner | hardliner hard-liner |
| Färinger | Faroe islander Faroese |
| Merowinger | Merovingians |
| Karo-Bauer | jack of diamonds |
| Karotinoid | carotenoid |
| Karrier | English Carrier |
| Karzinogen | carcinogen |
| karzinogen | carcinogenic |
| Karelien | Karelia Republic of Karelia |
| Karner | ossuary |
| Karotin | carotene carotin |
| Karthager | Carthaginian |
| Kärntner | Carinthian |