whiting vs percoid

whiting and percoid both are nouns.

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

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

Other hypernyms of whiting include percoid fish, percoidean.

whiting (noun)	percoid (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