- k
- kaftan
- Kalahari Desert
- kale
- kaleidoscope
- Kampuchea
- kangaroo
- kaolin
- kaput
- karaoke
- karat
- karate
- Kashmir
- kayak
- KB
- KC
- kcal
- kebab
- kedgeree
- keel
- keen
- keenly
- keenness
- keep
- keeper
- keep-fit
- keeping
- keepsake
- keg
- ken
- kennel
- Kenya
- kept
- kerb
- kerb crawler
- kerbstone
- kerfuffle
- kernel
- kerosene
- kestrel
- ketchup
- kettle
- kettledrum
- key
- key ring
- keyboard
- keyed up
- keyhole
- keynote
- keypad
- keystone
- keystroke
- kg
- KGB
- khaki
- kHz
- kibbutz
- kick
- kickoff
- kick-start
- kid
- kid gloves
- kiddie
- kidnap
- kidnapper
- kidnapping
- kidney
- kidney bean
- kidney machine
- Kilimanjaro
- kill
- killer
- killer whale
- killing
- killjoy
- kiln
- kilo
- kilo-
- kilobyte
- kilocalorie
- kilogram
- kilohertz
- kilojoule
- kilometre
- kilowatt
- kilt
- kimono
- kin
- kind
- kindergarten
- kind-hearted
- kindle
- kindling
- kindly
- kindness
- kindred
- kinetic
- kinfolk
- king
- king prawn
- kingdom
- kingfisher
- kingpin
- king-size
- kink
- kinky
- kinsfolk
- kinship
- kiosk
- kip
- kipper
- kiss
- kiss of death
- kiss of life
- kit
- kit bag
- kitchen
- kitchen garden
- kitchen roll
- kitchen sink
- kitchen unit
- kitchenette
- kite
- Kite-mark
- kitesurfing
- kith
- kitten
- kitty
- kiwi
- kiwi fruit
- KKK
- klaxon
- Kleenex®
- kleptomaniac
- km
- km/h
- knack
- knacker
- knackered
- knapsack
- knave
- knead
- knee
- kneecap
- knee-deep
- knee-high
- kneel
- knee-length
- knees-up
- knell
- knelt
- knew
- knickers
- knick-knacks
- knife
- knight
- knighthood
- knit
- knitted
- knitting
- knitting needle
- knitting pattern
- knitwear
- knives
- knob
- knobbly
- knock
- knocker
- knocking
- knock-kneed
- knock-on effect
- knockout
- knockout competition
- knot
- knotted
- knotty
- know
- know-all
- know-how
- knowing
- knowingly
- know-it-all
- knowledge
- knowledgeable
- known
- knuckle
- knuckle-duster
- KO
- koala
- kooky
- Koran
- Korea
- Korean
- kosher
- kowtow
- Kremlin
- KS
- Ku Klux Klan
- Kuala Lumpur
- kudos