come apart vs crush

come apart is not a noun while crush is a noun.

Word	Noun	Adjective	Verb	Adverb
come apart	No	No	Yes	No
crush	Yes	No	Yes	No

As verbs, crush is a hyponym of come apart; that is, crush is a word with a more specific, narrower meaning than come apart:

come apart (noun)	crush (noun)
	the act of crushing
	temporary love of an adolescent
	a dense crowd of people
	leather that has had its grain pattern accentuated

come apart (verb)	crush (verb)
become separated into pieces or fragments	break into small pieces
	become injured, broken, or distorted by pressure
	come out better in a competition, race, or conflict
	make ineffective
	to compress with violence, out of natural shape or condition
	crush or bruise
	humiliate or depress completely
	come down on or keep down by unjust use of one's authority