quiescence vs inactive

quiescence is a noun but inactive is not a noun.

Word	Noun	Adjective	Verb	Adverb
quiescence	Yes	No	No	No
inactive	No	Yes	No	No

quiescence (noun)	inactive (noun)
quiet and inactive restfulness
a state of quiet (but possibly temporary) inaction

quiescence (adjective)	inactive (adjective)
	(military) not involved in military operations
	not active physically or mentally
	(pathology) not progressing or increasing; or progressing slowly
	lacking activity; lying idle or unused
	lacking in energy or will
	(of e.g. volcanoes) not erupting and not extinct
	not exerting influence or change
	not engaged in full-time work
	not in physical motion
	(chemistry) not participating in a chemical reaction; chemically inert