kick
amok
Kick or kite would work.
Some words starting with the letter K are:KiteKittenKryptonKitchenKalemiaKaratKnightKnitkindkookykilling
kitten
KeepingKnelledKeelingKillersKingpinKnowing
kneePatella is the scientific name for the knee cap.
kangaroos
Kinky!
kleptomaniacs
kilter
kook