pollock vs Pollachius pollachius

pollock and Pollachius pollachius both are nouns.

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

As nouns, pollock and Pollachius pollachius are synonyms defined as:

pollock and Pollachius pollachius: important food and game fish of northern seas (especially the northern Atlantic); related to cod

Other synonyms of pollock include pollack.

pollock (noun)	Pollachius pollachius (noun)
important food and game fish of northern seas (especially the northern Atlantic); related to cod	important food and game fish of northern seas (especially the northern Atlantic); related to cod
lean white flesh of North Atlantic fish; similar to codfish