pollock vs gadoid fish

pollock and gadoid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
pollock	Yes	No	No	No
gadoid fish	Yes	No	No	No

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

pollock: important food and game fish of northern seas (especially the northern Atlantic); related to cod
gadoid fish: a soft-finned fish of the family Gadidae

Other hypernyms of pollock include gadoid.

pollock (noun)	gadoid fish (noun)
important food and game fish of northern seas (especially the northern Atlantic); related to cod	a soft-finned fish of the family Gadidae
lean white flesh of North Atlantic fish; similar to codfish