quahog vs round clam

quahog and round clam both are nouns.

Word	Noun	Adjective	Verb	Adverb
quahog	Yes	No	No	No
round clam	Yes	No	No	No

As nouns, quahog and round clam are synonyms defined as:

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

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

As nouns, quahog and round clam are synonyms defined as:

quahog and round clam: Atlantic coast round clams with hard shells; large clams usually used for chowders or other clam dishes

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

quahog (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	Atlantic coast round clams with hard shells; large clams usually used for chowders or other clam dishes