| kariogen | cariogenic |
| Karien | Caria |
| Karzinogen | carcinogen |
| karzinogen | carcinogenic |
| kargen | economize |
| Kerogen | kerogen |
| Kriegen | catch tag tig tiggy tip |
| kriegen | get come down with have catch |
| Kardone | cardoon |
| Karin | Karin |
| karren | cart bring |
| Karren | cart Karren |
| Karaoke | karaoke |
| Karbon | Carboniferous |
| Karelien | Karelia Republic of Karelia |
| Karies | caries |
| Karobe | St John's-bread |
| Karotin | carotene carotin |
| Karpaten | Carpathians Carpathian Mountains |
| Karpfen | carp |