coho vs blue jack

coho and blue jack both are nouns.

Word	Noun	Adjective	Verb	Adverb
coho	Yes	No	No	No
blue jack	Yes	No	No	No

As nouns, coho and blue jack are synonyms defined as:

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

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

coho (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