class Hexapoda vs order Trichoptera

class Hexapoda and order Trichoptera both are nouns.

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

class Hexapoda (noun)	order Trichoptera (noun)
insects; about five-sixths of all known animal species	an order of insects consisting of caddis flies