class Hexapoda vs Dictyoptera

class Hexapoda and Dictyoptera both are nouns.

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

class Hexapoda (noun)	Dictyoptera (noun)
insects; about five-sixths of all known animal species	in some classifications replaced by the orders (here suborders) Blattodea (cockroaches) and Manteodea (mantids); in former classifications often subsumed under a much broader order Orthoptera