recoil vs kick back

recoil is a noun but kick back is not a noun.

Word	Noun	Adjective	Verb	Adverb
recoil	Yes	No	Yes	No
kick back	No	No	Yes	No

As verbs, recoil and kick back are synonyms defined as:

Other synonyms of recoil include kick.

As verbs, kick back is a hyponym of recoil; that is, kick back is a word with a more specific, narrower meaning than recoil:

Other hyponyms of recoil include kick, recoil, bound off, skip, carom.

recoil (noun)	kick back (noun)
a movement back from an impact
the backward jerk of a gun when it is fired

recoil (verb)	kick back (verb)
spring back, as from a forceful thrust	spring back, as from a forceful thrust
draw back, as with fear or pain	pay a kickback; make an illegal payment
spring back; spring away from an impact
come back to the originator of an action with an undesired effect