- Kestrel
- Ketch
- Ketchup
- Kettle
- Keyboard
- Keys
- Keyword
- Kharif
- Khus khus grass
- Kibosh
- Kick-off
- Kicking
- Kiddy
- Kidney-bean
- Kidneys
- Kill by inches
- Kill two birds with one stone
- Killed
- Killer
- Kilo
- Kilohertz
- Kind
- Kindly
- Kinds
- Kinesthetic
- Kinetic energy
- King fish
- King mackerel
- King of kerala
- King of small aloe
- King's
- King-maker
- King-size
- Kingdom
- Kowtows
- Kings fool
- Kinkily
- Kinky
- Kiosk
- Kipper
- Kirk
- Kitchen charcoal
- Kitschy
- Kleptomania
- Kleptomaniac
- Klutz
- Knave
- Knavery
- Knead
- Kneading machine
- Knee-jerk
- Kneel
- Knees
- Knight
- Knight of the road
- Knit ones brows
- Knitting-needle
- Knitwear
- Knobbly
- Knock
- Knock down to
- Knock knee
- Knocking someone with a feather
- Knottiness
- Knotty
- Know ones stuff
- Know through and through
- Know-how
- Knowingness
- Knowledge
- Knowledgeable
- Knox
- Knuckle-down
- Knucklehead
- Knuckles
- Ko
- Koel
- Koinonia
- Kopeck
- Kottakkal
- Kottayanadu in malabar
- Krill
- Krishnagatha
- Krita-thretha-dwapara ages
- Krypton
- Kshatriya
- Ksr
- Kulak
- Kulasekhara varma
- Kumarakoil
- Kunchan nambiar
- Kurava
- Kuravar
- Kwarshiorkor
- Kyphosis