pubescent vs pubescence

pubescent is not a noun while pubescence is a noun.

Word	Noun	Adjective	Verb	Adverb
pubescent	No	Yes	No	No
pubescence	Yes	No	No	No

pubescent (noun)	pubescence (noun)
	the time of life when sex glands become functional

pubescent (adjective)	pubescence (adjective)
covered with fine soft hairs or down
(of animals especially human beings) having arrived at the onset of puberty (the age at which sex glands become functional) but not yet fully mature