breaking vs rupture

breaking and rupture both are nouns.

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

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

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

breaking (noun)	rupture (noun)
the act of breaking something	the act of making a sudden noisy break
	a personal or social separation (as between opposing factions)
	state of being torn or burst open

breaking (verb)	rupture (verb)
	separate or cause to separate abruptly