bivalve vs scallop

bivalve and scallop both are nouns.

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

As nouns, scallop is a hyponym of bivalve; that is, scallop is a word with a more specific, narrower meaning than bivalve:

bivalve: marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together
scallop: edible marine bivalve having a fluted fan-shaped shell that swim by expelling water from the shell in a series of snapping motions

Other hyponyms of bivalve include clam, cockle, oyster, ark shell, blood clam, mussel, escallop, scollop, piddock.

bivalve (noun)	scallop (noun)
marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together	edible marine bivalve having a fluted fan-shaped shell that swim by expelling water from the shell in a series of snapping motions
	edible muscle of mollusks having fan-shaped shells; served broiled or poached or in salads or cream sauces
	thin slice of meat (especially veal) usually fried or broiled
	one of a series of rounded projections (or the notches between them) formed by curves along an edge (as the edge of a leaf or piece of cloth or the margin of a shell or a shriveled red blood cell observed in a hypertonic solution etc.)

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

bivalve (verb)	scallop (verb)
	shape or cut in scallops
	fish for scallops
	form scallops in
	decorate an edge with scallops
	bake in a sauce, milk, etc., often with breadcrumbs on top