| Kollektion | collection |
| Kollektor | collector |
| Kollation | collating collation |
| Kollektiv | collective |
| kollektiv | collective |
| Kollokation | collocation |
| Konfektion | make manufacture ready-to-wear off-the-peg clothing off-the-rack clothing clothing industry |
| Kolligation | colligation |
| Kollegin | colleague |
| Kollekte | offertory |
| Kollektivum | collective noun |
| Kollision | collision |
| Kollusion | collusion |
| Pollution | nocturnal emission |
| Reflektion | reflection |
| Elektion | election |
| Lektion | lesson |
| Selektion | screening selection |
| Konduktion | conduction |
| Koalition | coalition |