drooping vs biological science

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

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

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

drooping (adjective)	biological science (adjective)
hanging down (as from exhaustion or weakness)
weak from exhaustion
having branches or flower heads that bend downward