Venus mercenaria vs hard clam

Venus mercenaria and hard clam both are nouns.

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

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

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

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

Venus 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