| Kolostrum | colostrum beestings foremilk |
| Kolosseum | Colosseum |
| Kostüm | suit costume fancy dress |
| Ökostrom | clean power eco-power |
| Golfstrom | Gulf Stream |
| Lustrum | lustrum five-year period quinquennium |
| Monstrum | monster |
| Kolluvium | colluvium |
| Kolabaum | kola kola nut tree |
| Kollegium | collegium |
| Kollodium | collodion |
| Kolloquium | colloquium examination symposium test |
| Kollyrium | collyrium |
| Koloratur | coloratura |
| Koloskop | colonoscope |
| Koloss | colossus |
| Kolosser | Colossian Colossians |
| Kolporteur | colporter colporteur |
| kolossal | colossal huge |
| Molossus | molossus |