| Kollusion | collusion |
| Kollision | collision |
| Kollation | collating collation |
| Pollution | nocturnal emission |
| Zollunion | customs union |
| Allusion | allusion |
| Illusion | illusion |
| Konklusion | conclusion |
| Konfusion | bewilderment |
| Kolluvium | colluvium |
| Kollegin | colleague |
| Kollektion | collection |
| Exklusion | exclusion |
| Inklusion | inclusion |
| Okklusion | occlusion |
| Kohäsion | cohesion |
| Konkussion | concussion |
| Konvulsion | convulsion |
| Korrosion | corrosion |
| Kellion | cell monastery |