biological science vs sessile

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

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

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

biological science (adjective)	sessile (adjective)
	attached directly by the base; not having an intervening stalk
	permanently attached to a substrate; not free to move about