pubescent vs biology

pubescent is not a noun while biology is a noun.

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

pubescent (noun)	biology (noun)
	the science that studies living organisms
	all the plant and animal life of a particular region
	characteristic life processes and phenomena of living organisms

pubescent (adjective)	biology (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