inactivity vs rest

inactivity and rest both are nouns.

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

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

Other hyponyms of inactivity include pause, wait, waiting, ease, relaxation, repose, idleness, idling, loafing, delay, holdup.

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

inactivity (noun)	rest (noun)
being inactive; being less active	freedom from activity (work or strain or responsibility)
a disposition to remain inactive or inert	a support on which things can be put
the state of being inactive	a musical notation indicating a silence of a specified duration
	something left after other parts have been taken away
	a state of inaction
	euphemisms for death (based on an analogy between lying in a bed and in a tomb)
	a pause for relaxation

inactivity (verb)	rest (verb)
	be at rest
	stay the same; remain in a certain state
	take a short break from one's activities in order to relax
	give a rest to
	not move; be in a resting position
	sit, as on a branch
	rest on or as if on a pillow
	put something in a resting position, as for support or steadying
	be inactive, refrain from acting
	have a place in relation to something else
	be inherent or innate in