order Mecoptera vs class Hexapoda

order Mecoptera and class Hexapoda both are nouns.

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

order Mecoptera (noun)	class Hexapoda (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