inactivity vs ease

inactivity and ease both are nouns.

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

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

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

inactivity (noun)	ease (noun)
being inactive; being less active	freedom from activity (work or strain or responsibility)
a disposition to remain inactive or inert	freedom from difficulty or hardship or effort
the state of being inactive	freedom from constraint or embarrassment
	a freedom from financial difficulty that promotes a comfortable state
	the condition of being comfortable or relieved (especially after being relieved of distress)

inactivity (verb)	ease (verb)
	lessen pain or discomfort; alleviate
	make easier
	lessen the intensity of or calm
	move gently or carefully