quahog vs hard-shell clam

quahog and hard-shell clam both are nouns.

Word	Noun	Adjective	Verb	Adverb
quahog	Yes	No	No	No
hard-shell clam	Yes	No	No	No

As nouns, quahog and hard-shell clam are synonyms defined as:

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

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

As nouns, quahog and hard-shell clam are synonyms defined as:

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

Other synonyms of quahog include quahaug, round clam.

quahog (noun)	hard-shell 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