| Kohlenhydrat | carbohydrate |
| Kalkhydrat | slaked lime |
| Kohleherd | coal stove |
| Kohlensäure | carbonic acid |
| Kastenheirat | endogamy |
| Methanhydrat | methane clathrate methane hydrate methane ice |
| Kalkdydrat | calcium hydroxide |
| Klepsydra | clepsydra |
| Konzentrat | concentrate |
| Kohlechemie | carbochemistry |
| Kohlefaser | carbon fiber |
| Kohlendioxid | carbon |
| Kohlendioxyd | carbon dioxide |
| Kohleneimer | scuttle |
| Kohlenfisch | sablefish |
| Kohlenzeche | colliery |
| Kohlsalat | coleslaw |
| Kohlenstoff | carbon |
| Köhler | collier charburner charcoal burner pollock |
| Höhlenbär | cave bear |