soft-shell clam vs long-neck clam

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

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

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

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

Other synonyms of soft-shell clam include Mya arenaria, steamer, steamer clam.

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

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

Other synonyms of soft-shell clam include steamer, steamer clam.

soft-shell clam (noun)	long-neck 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