quiescent vs quiescence

quiescent is not a noun while quiescence is a noun.

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

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

quiescent (adjective)	quiescence (adjective)
being quiet or still or inactive
(pathology) causing no symptoms
not active or activated
marked by a state of tranquil repose