breakup vs invalidation

breakup and invalidation both are nouns.

Word	Noun	Adjective	Verb	Adverb
breakup	Yes	No	No	No
invalidation	Yes	No	No	No

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

breakup: the termination or disintegration of a relationship (between persons or nations)
invalidation: (law) a formal termination (of a relationship or a judicial proceeding etc)

Other hyponyms of breakup include splitsville, annulment.

breakup (noun)	invalidation (noun)
the termination or disintegration of a relationship (between persons or nations)	(law) a formal termination (of a relationship or a judicial proceeding etc)
coming apart	when a person's thoughts and feelings are rejected, ignored, or judged.