There are no four letter words that begin with k and include the letter z.
A kepi is a French military cap.
king
Knot.
A two word thing beginning with the letter k is kami kazi.
kangaroos
king
khaki, kicks
Kind, king, knit, kilo, kiln, knot, kilt, keep, keen, know.
kite
I think there is none
Kinetic and kleptomaniac begin with the letter k. They end with the letter c.
kite