class Hexapoda vs order Psocoptera

class Hexapoda and order Psocoptera both are nouns.

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

class Hexapoda (noun)	order Psocoptera (noun)
insects; about five-sixths of all known animal species	an order of insects: includes booklice and bark-lice