Pollachius vs pollack

Pollachius and pollack both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pollachius	Yes	No	No	No
pollack	Yes	No	No	No

Pollachius (noun)	pollack (noun)
pollack	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