biological science vs semiaquatic

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

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

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

biological science (adjective)	semiaquatic (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