long-neck clam vs soft-shell clam

long-neck clam and soft-shell clam both are nouns.

Word	Noun	Adjective	Verb	Adverb
long-neck clam	Yes	No	No	No
soft-shell clam	Yes	No	No	No

As nouns, long-neck clam and soft-shell clam are synonyms defined as:

long-neck clam and soft-shell clam: an edible clam with thin oval-shaped shell found in coastal regions of the United States and Europe

Other synonyms of long-neck clam include Mya arenaria, steamer, steamer clam.

As nouns, long-neck clam and soft-shell clam are synonyms defined as:

long-neck clam and soft-shell clam: a clam that is usually steamed in the shell

Other synonyms of long-neck clam include steamer, steamer clam.

long-neck clam (noun)	soft-shell clam (noun)
an edible clam with thin oval-shaped shell found in coastal regions of the United States and Europe	an edible clam with thin oval-shaped shell found in coastal regions of the United States and Europe
a clam that is usually steamed in the shell	a clam that is usually steamed in the shell