lamellibranch vs bivalve

lamellibranch and bivalve both are nouns.

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

As nouns, lamellibranch and bivalve are synonyms defined as:

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

Other synonyms of lamellibranch include pelecypod.

lamellibranch (noun)	bivalve (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

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