| Karyopse | caryopsis |
| Karosse | body |
| Kardone | cardoon |
| Karyotyp | karyotype |
| Karaoke | karaoke |
| Karniese | curtain pole |
| Karoass | ace of diamonds |
| Karobe | St John's-bread |
| Karotte | baby carrot carrot |
| Karwoche | Holy Week Passion Week |
| kariös | decayed |
| Eukaryote | eukaryote |
| Ikaros | Icarus |
| Karacke | carrack |
| Karaime | Karaim |
| Karaïme | Karaim |
| Karbonat | carbonate |
| Kardioide | cardioid |
| Karlovac | Karlovac |
| Karnotit | carnotite |