expiry vs ending

expiry and ending both are nouns.

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

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

Other hypernyms of expiry include end.

expiry (noun)	ending (noun)
the event of dying or departure from life	the act of ending something
a coming to an end of a contract period	the end of a word (a suffix or inflectional ending or final morpheme)
	the last section of a communication
	event whose occurrence ends something
	the point in time at which something ends