semiaquatic vs biology

semiaquatic is not a noun while biology is a noun.

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

semiaquatic (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

semiaquatic (adjective)	biology (adjective)
partially aquatic; living or growing partly on land and partly in water
having an aquatic early or larval form and a terrestrial adult form