| Karzinogen | carcinogen |
| karzinogen | carcinogenic |
| kariogen | cariogenic |
| Karzinom | carcinoma |
| kriminogen | criminogenic |
| kanzerogen | cancer-causing carcinogenic |
| Kardinale | cardinal numeral |
| Kardiologin | cardiologist |
| Karien | Caria |
| Karolinen | Caroline Islands |
| Kartenlegen | cartomancy |
| Kardiologe | cardiologist |
| Karnivore | carnivore |
| Karolinger | Carolingian |
| Kärnten | Carinthia |
| kargen | economize |
| verzinken | galvanize zinc betray |
| verzinnen | tin |
| kalzinieren | calcine |
| Halluzinogen | hallucinogen |
| halluzinogen | hallucinogenic |