anergy vs inactivity

anergy and inactivity both are nouns.

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

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

Other hypernyms of anergy include inaction, inactiveness.

anergy (noun)	inactivity (noun)
reduction or lack of an immune response to a specific antigen	being inactive; being less active
inactivity and lack of energy	a disposition to remain inactive or inert
	the state of being inactive