expiry vs alteration

expiry and alteration both are nouns.

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

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

expiry: the event of dying or departure from life
alteration: an event that occurs when something passes from one state or phase to another

Other hypernyms of expiry include change, modification.

expiry (noun)	alteration (noun)
the event of dying or departure from life	the act of revising or altering (involving reconsideration and modification)
a coming to an end of a contract period	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