class Pelecypoda vs class Lamellibranchia

class Pelecypoda and class Lamellibranchia both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Pelecypoda	Yes	No	No	No
class Lamellibranchia	Yes	No	No	No

As nouns, class Pelecypoda and class Lamellibranchia are synonyms defined as:

class Pelecypoda and class Lamellibranchia: oysters, clams, scallops, mussels

Other synonyms of class Pelecypoda include Bivalvia, class Bivalvia, Lamellibranchia.

class Pelecypoda (noun)	class Lamellibranchia (noun)
oysters, clams, scallops, mussels	oysters, clams, scallops, mussels