quiescency vs slumber

quiescency and slumber both are nouns.

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

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

Other hyponyms of quiescency include hibernation, aestivation, estivation.

quiescency (noun)	slumber (noun)
quiet and inactive restfulness	a dormant or quiescent state
a state of quiet (but possibly temporary) inaction	a natural and periodic state of rest during which consciousness of the world is suspended

quiescency (verb)	slumber (verb)
	be asleep