order Lepidoptera vs Hexapoda

order Lepidoptera and Hexapoda both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Lepidoptera	Yes	No	No	No
Hexapoda	Yes	No	No	No

order Lepidoptera (noun)	Hexapoda (noun)
moths and butterflies	insects; about five-sixths of all known animal species