kick vs kick in

kick is a noun but kick in is not a noun.

Word	Noun	Adjective	Verb	Adverb
kick	Yes	No	Yes	No
kick in	No	No	Yes	No

kick (noun)	kick in (noun)
the act of delivering a blow with the foot
a rhythmic thrusting movement of the legs as in swimming or calisthenics
the sudden stimulation provided by strong drink (or certain drugs)
informal terms for objecting
the backward jerk of a gun when it is fired
the swift release of a store of affective force

kick (verb)	kick in (verb)
express complaints, discontent, displeasure, or unhappiness	open violently
make a goal	contribute to some cause
stop consuming	enter a particular state
strike with the foot
drive or propel with the foot
spring back, as from a forceful thrust
thrash about or strike out with the feet
kick a leg up