I think there is none
A two word thing beginning with the letter k is kami kazi.
kangaroos
khaki, kicks
There are no four letter words that begin with k and include the letter z.
Kinetic and kleptomaniac begin with the letter k. They end with the letter c.
The area beyond the planets is known as the Kuiper belt. It begins with the letter K.
knapsacks
mcdonalds
keynote
Yes. The k at the beginning of the word is silent.
broomstick
Killshot