breakup vs alteration

breakup and alteration both are nouns.

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

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

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

Other hypernyms of breakup include change, modification.

breakup (noun)	alteration (noun)
the termination or disintegration of a relationship (between persons or nations)	the act of revising or altering (involving reconsideration and modification)
coming apart	the act of making something different (as e.g. the size of a garment)
	an event that occurs when something passes from one state or phase to another