puberulent vs biological science

puberulent is not a noun while biological science is a noun.

Word	Noun	Adjective	Verb	Adverb
puberulent	No	Yes	No	No
biological science	Yes	No	No	No

puberulent (noun)	biological science (noun)
	the science that studies living organisms

puberulent (adjective)	biological science (adjective)
covered with fine soft hairs or down