| Kondolenzbuch | book of condolence book of condolences |
| Kondolenz | condolence |
| Kontobuch | account book |
| kongolesisch | Congolese |
| Kinderbuch | children's book |
| Kondominium | condominium |
| Kondensmilch | condensed milk evaporated milk dehydrated milk |
| konsonantisch | consonantal |
| londonisch | London |
| Indolenz | idleness |
| Mongolenfleck | Mongolian spot |
| Kohlenfisch | sablefish |
| Kohlenzeche | colliery |
| Korallenfisch | butterfly fish |
| Lendentuch | loincloth |
| Referenzbuch | reference book |
| Notizbuch | notebook |
| Kassenbuch | ledger |
| Kopialbuch | cartulary |
| Studienbuch | transcript |