haddock vs gadoid fish

haddock and gadoid fish both are nouns.

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

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

haddock: important food fish on both sides of the Atlantic; related to cod but usually smaller
gadoid fish: a soft-finned fish of the family Gadidae

Other hypernyms of haddock include gadoid.

haddock (noun)	gadoid fish (noun)
important food fish on both sides of the Atlantic; related to cod but usually smaller	a soft-finned fish of the family Gadidae
lean white flesh of fish similar to but smaller than cod; usually baked or poached or as fillets sauteed or fried