Lamellibranchia vs class Bivalvia

Lamellibranchia and class Bivalvia both are nouns.

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

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

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

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