hibernation vs quiescency

hibernation and quiescency both are nouns.

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

As nouns, quiescency is a hypernym of hibernation; that is, quiescency is a word with a broader meaning than hibernation:

hibernation: cessation from or slowing of activity during the winter; especially slowing of metabolism in some animals
quiescency: a state of quiet (but possibly temporary) inaction

Other hypernyms of hibernation include dormancy, quiescence.

hibernation (noun)	quiescency (noun)
the act of retiring into inactivity	quiet and inactive restfulness
the torpid or resting state in which some animals pass the winter	a state of quiet (but possibly temporary) inaction
cessation from or slowing of activity during the winter; especially slowing of metabolism in some animals