snail vs edible snail

snail and edible snail both are nouns.

Word	Noun	Adjective	Verb	Adverb
snail	Yes	No	Yes	No
edible snail	Yes	No	No	No

As nouns, edible snail is a hyponym of snail; that is, edible snail is a word with a more specific, narrower meaning than snail:

snail: freshwater or marine or terrestrial gastropod mollusk usually having an external enclosing spiral shell
edible snail: one of the chief edible snails

Other hyponyms of snail include scorpion shell, Helix pomatia, garden snail.

snail (noun)	edible snail (noun)
freshwater or marine or terrestrial gastropod mollusk usually having an external enclosing spiral shell	one of the chief edible snails
edible terrestrial snail usually served in the shell with a sauce of melted butter and garlic

snail (verb)	edible snail (verb)
gather snails