class Hexapoda vs order mantophasmatodea

class Hexapoda and order mantophasmatodea both are nouns.

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

class Hexapoda (noun)	order 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