Mecoptera vs class Insecta

Mecoptera and class Insecta both are nouns.

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

Mecoptera (noun)	class Insecta (noun)
an order of carnivorous insects usually having long membranous wings and long beaklike heads with chewing mouths at the tip	insects; about five-sixths of all known animal species