rupture vs falling out

rupture and falling out both are nouns.

Word	Noun	Adjective	Verb	Adverb
rupture	Yes	No	Yes	No
falling out	Yes	No	No	No

As nouns, rupture and falling out are synonyms defined as:

rupture and falling out: a personal or social separation (as between opposing factions)

Other synonyms of rupture include breach, break, rift, severance.

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

rupture (verb)	falling out (verb)
separate or cause to separate abruptly