round clam vs round clam

round clam and round clam both are nouns.

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

round clam (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