hard clam vs quahaug

hard clam and quahaug both are nouns.

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

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

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

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

hard 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