breakup vs termination

breakup and termination both are nouns.

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

As nouns, termination is a hypernym of breakup; that is, termination is a word with a broader meaning than breakup:

breakup: the termination or disintegration of a relationship (between persons or nations)
termination: the act of ending something

Other hypernyms of breakup include conclusion, ending.

breakup (noun)	termination (noun)
the termination or disintegration of a relationship (between persons or nations)	the act of ending something
coming apart	the end of a word (a suffix or inflectional ending or final morpheme)
	something that results
	a place where something ends or is complete
	a coming to an end of a contract period