bivalve vs lamellibranch

bivalve and lamellibranch both are nouns.

Word	Noun	Adjective	Verb	Adverb
bivalve	Yes	Yes	No	No
lamellibranch	Yes	Yes	No	No

As nouns, bivalve and lamellibranch are synonyms defined as:

bivalve and lamellibranch: marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together

Other synonyms of bivalve include pelecypod.

bivalve (noun)	lamellibranch (noun)
marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together	marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together

bivalve (adjective)	lamellibranch (adjective)
used of mollusks having two shells (as clams etc.)	bivalve