extinction vs inactivity

extinction and inactivity both are nouns.

Word	Noun	Adjective	Verb	Adverb
extinction	Yes	No	No	No
inactivity	Yes	No	No	No

As nouns, inactivity is a hypernym of extinction; that is, inactivity is a word with a broader meaning than extinction:

Other hypernyms of extinction include inaction, inactiveness.

extinction (noun)	inactivity (noun)
the act of extinguishing; causing to stop burning	being inactive; being less active
a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus	a disposition to remain inactive or inert
complete annihilation	the state of being inactive
the reduction of the intensity of radiation as a consequence of absorption and radiation
no longer in existence
no longer active; extinguished