class Hexapoda vs order Coleoptera

class Hexapoda and order Coleoptera both are nouns.

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

class Hexapoda (noun)	order Coleoptera (noun)
insects; about five-sixths of all known animal species	beetles