breakup vs modification

breakup and modification both are nouns.

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

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

breakup: coming apart
modification: an event that occurs when something passes from one state or phase to another

Other hypernyms of breakup include alteration, change.

breakup (noun)	modification (noun)
the termination or disintegration of a relationship (between persons or nations)	the act of making something different (as e.g. the size of a garment)
coming apart	slightly modified copy; not an exact copy
	an event that occurs when something passes from one state or phase to another
	the grammatical relation that exists when a word qualifies the meaning of the phrase