whiting vs percoid fish

whiting and percoid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
whiting	Yes	No	No	No
percoid fish	Yes	No	No	No

As nouns, percoid fish is a hypernym of whiting; that is, percoid fish is a word with a broader meaning than whiting:

Other hypernyms of whiting include percoid, percoidean.

whiting (noun)	percoid fish (noun)
a food fish of the Atlantic waters of Europe resembling the cod; sometimes placed in genus Gadus	any of numerous spiny-finned fishes of the order Perciformes
any of several food fishes of North American coastal waters
found off Atlantic coast of North America
a small fish of the genus Sillago; excellent food fish
flesh of any of a number of slender food fishes especially of Atlantic coasts of North America
flesh of a cod-like fish of the Atlantic waters of Europe