| Konventionen | decorum |
| Konvention | convention |
| konventionell | conventional |
| Konventikel | conventicle |
| konvenieren | be suitable |
| konvertieren | convert |
| konnektieren | bind |
| Konfektion | make manufacture ready-to-wear off-the-peg clothing off-the-rack clothing clothing industry |
| Konversion | conversion |
| Konzeption | conception |
| kondensieren | condense precipitate |
| konvenient | convenient |
| konvergieren | converge |
| konversieren | converse make conversation |
| konzentrieren | concentrate |
| konzeptionell | conceptual |
| konzertieren | give a concert concert |
| unkonventionell | unconventional |
| Invention | invention |
| inventieren | invent |