biological science vs drooping

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

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

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

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