biology vs pubescent

biology is a noun but pubescent is not a noun.

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

biology (noun)	pubescent (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

biology (adjective)	pubescent (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