class Crustacea vs subclass Copepoda

class Crustacea and subclass Copepoda both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Crustacea	Yes	No	No	No
subclass Copepoda	Yes	No	No	No

class Crustacea (noun)	subclass Copepoda (noun)
class of mandibulate arthropods including: lobsters, crabs, shrimps, woodlice, barnacles, decapods, water fleas	minute planktonic or parasitic crustaceans