ruin vs kick in

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

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

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

ruin (noun)	kick in (noun)
destruction achieved by causing something to be wrecked or ruined
a ruined building
an event that results in destruction
failure that results in a loss of position or reputation
the process of becoming dilapidated
an irrecoverable state of devastation and destruction

ruin (verb)	kick in (verb)
fall into ruin	open violently
destroy completely; damage irreparably	contribute to some cause
reduce to ruins	enter a particular state
deprive of virginity
reduce to bankruptcy
destroy or cause to fail