Crustacea vs class Crustacea

Crustacea and class Crustacea both are nouns.

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

As nouns, Crustacea and class Crustacea are synonyms defined as:

Crustacea and class Crustacea: class of mandibulate arthropods including: lobsters, crabs, shrimps, woodlice, barnacles, decapods, water fleas

Crustacea (noun)	class Crustacea (noun)
class of mandibulate arthropods including: lobsters, crabs, shrimps, woodlice, barnacles, decapods, water fleas	class of mandibulate arthropods including: lobsters, crabs, shrimps, woodlice, barnacles, decapods, water fleas