inactivity vs waiting

inactivity and waiting both are nouns.

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

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

inactivity: being inactive; being less active
waiting: the act of waiting (remaining inactive in one place while expecting something)

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

inactivity (noun)	waiting (noun)
being inactive; being less active	the act of waiting (remaining inactive in one place while expecting something)
a disposition to remain inactive or inert
the state of being inactive

inactivity (adjective)	waiting (adjective)
	being and remaining ready and available for use