Acanthopterygii vs order Perciformes

Acanthopterygii and order Perciformes both are nouns.

Word	Noun	Adjective	Verb	Adverb
Acanthopterygii	Yes	No	No	No
order Perciformes	Yes	No	No	No

Acanthopterygii (noun)	order Perciformes (noun)
teleost fishes having fins with sharp bony rays	one of the largest natural groups of fishes of both marine and fresh water: true perches, basses, tuna