Mercenaria mercenaria vs hard clam

Mercenaria mercenaria and hard clam both are nouns.

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

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

Mercenaria mercenaria and hard 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, quahaug, quahog, round clam, Venus mercenaria.

Mercenaria mercenaria (noun)	hard 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