inactive vs quiescency

inactive is not a noun while quiescency is a noun.

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

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

inactive (adjective)	quiescency (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