pelecypod vs escallop

pelecypod and escallop both are nouns.

Word	Noun	Adjective	Verb	Adverb
pelecypod	Yes	Yes	No	No
escallop	Yes	No	Yes	No

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

pelecypod: marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together
escallop: 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 pelecypod include clam, cockle, oyster, ark shell, blood clam, mussel, scallop, scollop, piddock.

pelecypod (noun)	escallop (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

pelecypod (adjective)	escallop (adjective)
bivalve

pelecypod (verb)	escallop (verb)
	bake in a sauce, milk, etc., often with breadcrumbs on top