Phasmatodea vs class Insecta

Phasmatodea and class Insecta both are nouns.

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

Phasmatodea (noun)	class Insecta (noun)
in some classifications considered a suborder of Orthoptera: stick insects; leaf insects	insects; about five-sixths of all known animal species