whelk vs seafood

whelk and seafood both are nouns.

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

As nouns, seafood is a hypernym of whelk; that is, seafood is a word with a broader meaning than whelk:

whelk: large marine snail much used as food in Europe
seafood: edible fish (broadly including freshwater fish) or shellfish or roe etc

whelk (noun)	seafood (noun)
large carnivorous marine gastropods of coastal waters and intertidal regions having a strong snail-like shell	edible fish (broadly including freshwater fish) or shellfish or roe etc
large marine snail much used as food in Europe

whelk (verb)	seafood (verb)
gather whelk