- kaleidoscope
- karyokineses
- karyokinesis
- karyokinetic
- karyological
- katzenjammer
- keratinizing
- keratoplasty
- ketoconazole
- ketosteroids
- keyboardists
- kilocalories
- kindergarten
- kindlinesses
- kinesthesias
- kinetochores
- kinetoplasts
- kinetoscopes
- kinnikinnick
- kitchenettes
- kitchenwares
- kiteboarding
- kleptocratic
- kleptomaniac
- kleptomanias
- knightliness
- knuckleballs
- knucklebones
- knuckleheads
- kremlinology
- kwashiorkors
- kymographies