seafood vs whitefish

seafood and whitefish both are nouns.

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

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

seafood: edible fish (broadly including freshwater fish) or shellfish or roe etc
whitefish: any market fish--edible saltwater fish or shellfish--except herring

seafood (noun)	whitefish (noun)
edible fish (broadly including freshwater fish) or shellfish or roe etc	silvery herring-like freshwater food fish of cold lakes of the Northern Hemisphere
	flesh of salmon-like or trout-like cold-water fish of cold lakes of the Northern Hemisphere
	any market fish--edible saltwater fish or shellfish--except herring