Mercenaria mercenaria vs round clam

Mercenaria mercenaria and round clam both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mercenaria mercenaria	Yes	No	No	No
round clam	Yes	No	No	No

As nouns, Mercenaria mercenaria and round clam are synonyms defined as:

Mercenaria mercenaria and round clam: an edible American clam; the heavy shells were used as money by some American Indians

Other synonyms of Mercenaria mercenaria include hard-shell clam, hard clam, quahaug, quahog, Venus mercenaria.

Mercenaria mercenaria (noun)	round clam (noun)
an edible American clam; the heavy shells were used as money by some American Indians	an edible American clam; the heavy shells were used as money by some American Indians
	Atlantic coast round clams with hard shells; large clams usually used for chowders or other clam dishes