class Pelecypoda vs Lamellibranchia

class Pelecypoda and Lamellibranchia both are nouns.

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

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

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

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