death vs expiration

death and expiration both are nouns.

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

As nouns, expiration is a hyponym of death; that is, expiration is a word with a more specific, narrower meaning than death:

death (noun)	expiration (noun)
the act of killing	the act of expelling air from the lungs
the event of dying or departure from life	euphemistic expressions for death
the permanent end of all life functions in an organism or part of an organism	a coming to an end of a contract period
the absence of life or state of being dead
a final state
the time when something ends
the time at which life ends; continuing until dead