desuetude vs inactivity

desuetude and inactivity both are nouns.

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

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

Other hypernyms of desuetude include inaction, inactiveness.

desuetude (noun)	inactivity (noun)
a state of inactivity or disuse	being inactive; being less active
	a disposition to remain inactive or inert
	the state of being inactive