breaking vs crack

breaking and crack both are nouns.

Word	Noun	Adjective	Verb	Adverb
breaking	Yes	No	No	No
crack	Yes	Yes	Yes	No

As nouns, crack is a hyponym of breaking; that is, crack is a word with a more specific, narrower meaning than breaking:

Other hyponyms of breaking include rupture, shattering, smashing, cracking, fracture, chip, chipping, splintering.

breaking (noun)	crack (noun)
the act of breaking something	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

breaking (adjective)	crack (adjective)
	of the highest quality

breaking (verb)	crack (verb)
	break suddenly and abruptly, as under tension
	become fractured; break or crack on the surface only
	break partially but keep its integrity
	cause to become cracked
	reduce (petroleum) to a simpler compound by cracking
	break into simpler molecules by means of heat
	pass through (a barrier)
	tell spontaneously
	hit forcefully; deal a hard blow, making a cracking noise
	suffer a nervous breakdown
	make a sharp sound
	make a very sharp explosive sound
	gain unauthorized access computers with malicious intentions