- keystone joist
- keystone species
- keystroke
- keyway
- keyword
- keyword indexing
- keyword stuffing
- kg
- kg-m
- kg.
- kgf
- kh
- khaddar
- khaki
- khaki election
- khalif
- khalifa
- khalsa
- khamsin
- khan
- khanate
- khanda
- khanga
- khanjar
- khansamah
- khapra beetle
- kharif
- khat
- khatri
- khayal
- khazi
- kheda
- khedive
- khidmatgar
- khoja
- khoums
- khulan
- khurta
- khus-khus
- khuskhus
- khutbah
- khā
- ki
- kia kaha
- kia ora
- kiaat
- kiabooca
- kiang
- kiasu
- kiaugh
- kiawe
- kibble
- kibbutz
- kibbutznik
- kibe
- kibi-
- kibitka
- kibitz
- kibitzer
- kiblah
- kibosh
- kick
- kick a habit
- kick about
- kick around
- kick ass
- kick back
- kick boxing
- kick in
- kick in the pants, a
- kick it
- kick off
- kick on
- kick oneself
- kick out
- kick over the traces
- kick plate
- kick pleat
- kick starter
- kick the bucket
- kick the habit
- kick turn
- kick up
- kick up a fuss
- kick up one's heels
- kick upstairs
- kick-ass
- kick-start
- kick-up
- kickback
- kickball
- kickboard
- kickdown
- kicker
- kickoff
- kickshaw
- kicksorter
- kickstand
- kickup
- kickwheel
- kicky
- kid
- kid around
- kid glove
- kid gloves
- kid stuff
- kid the pants off
- kid-on
- kidder
- kiddie car
- kiddie porn
- kidding
- kiddle
- kiddo
- kiddy
- kideo
- kidnap
- kidney
- kidney bean
- kidney machine
- kidney ore
- kidney punch
- kidney stone
- kidney stones
- kidney vetch
- kidney worm
- kidney-shaped
- kidneys
- kidneywort
- kidology
- kidporn
- kids
- kids' stuff
- kidskin
- kidstakes
- kidult
- kidvid
- kief
- kiekie
- kielbasa
- kier
- kieselguhr
- kieserite
- kif
- kiff
- kike
- kikoi
- kikumon
- kil.
- kilderkin
- kiley
- kilij
- kilim
- kill
- kill off
- kill or cure
- kill shot
- kill switch
- kill the fatted calf
- kill the goose that lays the golden eggs
- kill time
- kill two birds with one stone
- kill with kindness
- kill-time
- killdee
- killdeer
- killer
- killer T cell
- killer app
- killer application
- killer bars
- killer bee
- killer boat
- killer cell
- killer whale
- killer-diller
- killick
- killickinnic
- killifish
- killikinick
- killing
- killing field
- killing frost
- killjoy
- kiln
- kiln run brick
- kiln-dried
- kiln-dry
- kilo
- kilo-
- kilobar
- kilobit
- kilobyte
- kilocalorie
- kilocurie
- kilocycle
- kiloelectron volt
- kilogauss
- kilogram
- kilogram calorie
- kilogram-force
- kilogram-meter
- kilohertz
- kiloliter
- kilolitre
- kilomegacycle
- kilometer
- kilometre
- kiloparsec
- kilopascal
- kiloton
- kilovolt
- kilovolt-ampere
- kilovoltage
- kilowatt
- kilowatt-hour
- kilo–
- kilt
- kilt pleat
- kilted
- kilter
- kiltie
- kilting
- kimbap
- kimberlite
- kimchi
- kimmer
- kimono
- kin
- kin selection
- kina
- kinaesthesia
- kinara
- kinase
- kinchin
- kincob
- kind
- kind of
- kind-hearted
- kinda
- kindergarten
- kindergartner
- kindhearted
- kindjal
- kindle
- kindless
- kindliness
- kindling
- kindly
- kindness
- kindred
- kindred spirit
- kindy
- kine
- kinematic pair
- kinematic viscosity
- kinematics
- kinematograph
- kinescope
- kinesics
- kinesiology
- kinesis
- kinesthesia
- kinesthetic
- kinetheodolite
- kinetic
- kinetic art
- kinetic energy
- kinetic friction
- kinetic potential
- kinetic theory
- kinetic theory of gases
- kinetic theory of heat
- kinetic theory of matter
- kineticism
- kinetics
- kinetin
- kineto-
- kinetochore
- kinetograph
- kinetoplast
- kinetoscope
- kinetosis
- kinfolk
- king
- king bee
- king closer
- king cobra
- king crab
- king devil
- king fern
- king mackerel
- king of beasts
- king of kings
- king of the castle
- king of the forest
- king of the herrings
- king of the hill
- king penguin
- king plank