crack vs break up

crack is a noun but break up is not a noun.

Word	Noun	Adjective	Verb	Adverb
crack	Yes	Yes	Yes	No
break up	No	No	Yes	No

As verbs, break up is a hypernym of crack; that is, break up is a word with a broader meaning than crack:

Other hypernyms of crack include break down, decompose.

As verbs, crack and break up are synonyms defined as:

Other synonyms of crack include collapse, crack up, crock up.

crack (noun)	break up (noun)
the act of cracking something
a usually brief attempt
a narrow opening
a purified and potent form of cocaine that is smoked rather than snorted; highly addictive
a blemish resulting from a break without complete separation of the parts
witty remark
a sudden sharp noise
a long narrow cleft
a long narrow depression in a surface
a chance to do something

crack (adjective)	break up (adjective)
of the highest quality

crack (verb)	break up (verb)
break suddenly and abruptly, as under tension	laugh unrestrainedly
become fractured; break or crack on the surface only	break or cause to break into pieces
break partially but keep its integrity	come to an end
cause to become cracked	separate (substances) into constituent elements or parts
reduce (petroleum) to a simpler compound by cracking	cause to go into a solution
break into simpler molecules by means of heat	cause to separate
pass through (a barrier)	close at the end of a session
tell spontaneously	bring the association of to an end or cause to break up
hit forcefully; deal a hard blow, making a cracking noise	make a break in
suffer a nervous breakdown	set or keep apart
make a sharp sound	break violently or noisily; smash
make a very sharp explosive sound	attack with or as if with a pickaxe of ice or rocky ground, for example
gain unauthorized access computers with malicious intentions	release ice
	destroy the completeness of a set of related items
	take apart into its constituent pieces
	suffer a nervous breakdown
	disband
	to cause to separate and go in different directions
	discontinue an association or relation; go different ways