class Insecta vs order Trichoptera

class Insecta and order Trichoptera both are nouns.

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

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