snail vs whelk

snail and whelk both are nouns.

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

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

snail (noun)	whelk (noun)
freshwater or marine or terrestrial gastropod mollusk usually having an external enclosing spiral shell	large carnivorous marine gastropods of coastal waters and intertidal regions having a strong snail-like shell
edible terrestrial snail usually served in the shell with a sauce of melted butter and garlic	large marine snail much used as food in Europe

snail (verb)	whelk (verb)
gather snails	gather whelk