semiaquatic vs biological science

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

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

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

semiaquatic (adjective)	biological science (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