| Konkrement | calculus |
| Inkrement | increment |
| Kondiment | condiment |
| Konkurrent | competitor |
| Konsument | consumer |
| Kontrahent | opponent rival counterparty |
| konkludent | conclusive implied |
| konkret | concrete |
| Dekrement | decrementation |
| Exkrement | excrement |
| Komplement | complement |
| Konkretion | concretion |
| Konnossement | bill of lading |
| Kontingent | contingent |
| kontingent | contingent |
| Konvent | convent |
| kontrieren | double |
| Konferenz | conference |
| Konkretum | concrete noun |
| Konkurrenz | competition competitor |