hard-shell clam vs quahaug

hard-shell clam and quahaug both are nouns.

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

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

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

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

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

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

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

hard-shell clam (noun)	quahaug (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