| Kontobuch | account book |
| Fotobuch | photobook |
| Kochbuch | cookbook |
| Kontor | office |
| Kontinuum | continuum |
| Konto | account |
| Kontur | contour outline |
| Konvolut | envelope |
| konisch | conical |
| königlich | royal enormous generous |
| pontisch | Pontic |
| ontisch | ontic |
| Ossobuco | osso buco |
| Bankbuch | passbook |
| Comicbuch | comic book |
| Kopialbuch | cartulary |
| Totenbuch | Book of the Dead |
| Gästebuch | guestbook |
| Handbuch | manual handbook |
| Hörbuch | audiobook audio book |