silver salmon vs blue jack

silver salmon and blue jack both are nouns.

Word	Noun	Adjective	Verb	Adverb
silver salmon	Yes	No	No	No
blue jack	Yes	No	No	No

As nouns, silver salmon and blue jack are synonyms defined as:

silver salmon and blue jack: small salmon of northern Pacific coasts and the Great Lakes

Other synonyms of silver salmon include coho, coho salmon, cohoe, Oncorhynchus kisutch.

silver salmon (noun)	blue jack (noun)
small salmon of northern Pacific coasts and the Great Lakes	small salmon of northern Pacific coasts and the Great Lakes
fatty pinkish flesh of small salmon caught in the Pacific and Great Lakes