expiration vs expiry

expiration and expiry both are nouns.

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

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

Other hypernyms of expiration include death, decease.

As nouns, expiration and expiry are synonyms defined as:

Other synonyms of expiration include termination.

expiration (noun)	expiry (noun)
the act of expelling air from the lungs	the event of dying or departure from life
euphemistic expressions for death	a coming to an end of a contract period
a coming to an end of a contract period