downy vs biological science

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

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

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

downy (adjective)	biological science (adjective)
covered with fine soft hairs or down
like down or as soft as down