vegetation vs quiescency

vegetation and quiescency both are nouns.

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

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

vegetation: inactivity that is passive and monotonous, comparable to the inactivity of plant life
quiescency: quiet and inactive restfulness

Other hypernyms of vegetation include dormancy, quiescence, sleeping.

vegetation (noun)	quiescency (noun)
inactivity that is passive and monotonous, comparable to the inactivity of plant life	quiet and inactive restfulness
an abnormal growth or excrescence (especially a warty excrescence on the valves of the heart)	a state of quiet (but possibly temporary) inaction
all the plant life in a particular region or period
the process of growth in plants