class Hexapoda vs Lepidoptera

class Hexapoda and Lepidoptera both are nouns.

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

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