Hymenoptera vs class Insecta

Hymenoptera and class Insecta both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hymenoptera	Yes	No	No	No
class Insecta	Yes	No	No	No

Hymenoptera (noun)	class Insecta (noun)
an order of insects including: bees, wasps, ants, ichneumons, sawflies, gall wasps, etc.	insects; about five-sixths of all known animal species