Kicks begins with "k" and the 4th letter is "k".
A five letter word containing N, K, and U is: plunk
Knock, knack
khaki, kicks
The five letter word is kilts
vodka
karma
Kindergartener
alkylketalkevelkneelknellknollknurlkraalkrillskillskirlskullvakilyokel
amuck
Kicks Kooky
kitty