laziness vs inactivity

laziness and inactivity both are nouns.

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

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

Other hypernyms of laziness include inactiveness, inertia.

laziness (noun)	inactivity (noun)
apathy and inactivity in the practice of virtue (personified as one of the deadly sins)	being inactive; being less active
relaxed and easy activity	a disposition to remain inactive or inert
inactivity resulting from a dislike of work	the state of being inactive