| Kopfstein | cobblestone |
| Kopistin | copyist |
| Tropfstein | dripstone stalactite stalagmite |
| Kotstein | coprolite |
| Kopfsteuer | poll tax |
| Kopfstoß | headbutt |
| Koptin | Copt |
| kopfstehend | topsy-turvy |
| Kopfstand | headstand |
| Köpfchen | brain head |
| köpfeln | head |
| köpfen | behead decapitate top head |
| Tuffstein | tuff |
| Prüfstein | touchstone |
| Taufstein | font |
| Hornstein | chert |
| Keilstein | voussoir |
| Tonstein | claystone |
| Bordstein | curb kerb |
| Holstein | Holstein |