- katmai national park
- katmandu
- katsura tree
- katsuwonus
- katsuwonidae
- kauri pine
- kauri copal
- kauri
- kavakava
- kavir desert
- kayser_fleischer ring
- kavrin
- kayo
- kayoed
- kayak
- kazimir severinovich malevich
- kean
- keel (of a boat)
- kechua
- keen
- keen intelligence
- kamba
- kamet
- kamikaze
- kampuchea
- kan river
- kanawha river
- kanawha
- kanaf
- kangaroo bear
- kangaroo mouse
- kangaroo paw
- karelia
- kangaroo rat
- kansas river
- kantian
- kantrex
- kaolin
- kaoline
- kaopectate
- kaplan group
- kapok
- kaposi's sarcoma
- kaposi's varicelliform eruption
- kapsiki
- kapuka
- kaput
- kara kum
- karabiner
- karaites