subaquatic vs biology

subaquatic is not a noun while biology is a noun.

Word	Noun	Adjective	Verb	Adverb
subaquatic	No	Yes	No	No
biology	Yes	No	No	No

subaquatic (noun)	biology (noun)
	the science that studies living organisms
	all the plant and animal life of a particular region
	characteristic life processes and phenomena of living organisms

subaquatic (adjective)	biology (adjective)
partially aquatic; living or growing partly on land and partly in water
growing or remaining under water