biological science vs subaqueous

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

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

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

biological science (adjective)	subaqueous (adjective)
	growing or remaining under water