order Trichoptera vs class Hexapoda

order Trichoptera and class Hexapoda both are nouns.

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

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