class Hexapoda vs order Neuroptera

class Hexapoda and order Neuroptera both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Hexapoda	Yes	No	No	No
order Neuroptera	Yes	No	No	No

class Hexapoda (noun)	order Neuroptera (noun)
insects; about five-sixths of all known animal species	an order of insects including: lacewings, antlions, dobsonflies, alderflies, fish flies, mantispids, spongeflies