semiaquatic vs aquatic

semiaquatic is not a noun while aquatic is a noun.

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

semiaquatic (noun)	aquatic (noun)
	a plant that lives in or on water

semiaquatic (adjective)	aquatic (adjective)
partially aquatic; living or growing partly on land and partly in water	operating or living or growing in water
having an aquatic early or larval form and a terrestrial adult form	relating to or consisting of or being in water