Pollachius pollachius vs gadoid

Pollachius pollachius and gadoid both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pollachius pollachius	Yes	No	No	No
gadoid	Yes	No	No	No

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

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

Other hypernyms of Pollachius pollachius include gadoid fish.

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