class Hexapoda vs Mantophasmatodea

class Hexapoda and Mantophasmatodea both are nouns.

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

class Hexapoda (noun)	Mantophasmatodea (noun)
insects; about five-sixths of all known animal species	an order of insect identified in 2002 in a 45 million year old piece of amber from the Baltic region