| Karambolagen | billiards |
| Karambolage | collision |
| Carambola | carambola |
| Kramladen | general store |
| Karamelle | caramel |
| Kardiologin | cardiologist |
| Karolinen | Caroline Islands |
| Kartenlegen | cartomancy |
| Karzinogen | carcinogen |
| karzinogen | carcinogenic |
| Kardiologe | cardiologist |
| kariogen | cariogenic |
| Kläranlage | sewage treatment plant wastewater treatment plant |
| Garbologe | garbologist |
| Garbologin | garbologist |
| Kabotage | cabotage |
| Kaumagen | gizzard |
| Kampfwagen | chariot tank |
| Kraftwagen | motor car |
| Karbolsäure | carbolic acid |