blueback salmon vs Oncorhynchus nerka

blueback salmon and Oncorhynchus nerka both are nouns.

Word	Noun	Adjective	Verb	Adverb
blueback salmon	Yes	No	No	No
Oncorhynchus nerka	Yes	No	No	No

As nouns, blueback salmon and Oncorhynchus nerka are synonyms defined as:

blueback salmon and Oncorhynchus nerka: small salmon with red flesh; found in rivers and tributaries of the northern Pacific and valued as food; adults die after spawning

Other synonyms of blueback salmon include red salmon, sockeye, sockeye salmon.

blueback salmon (noun)	Oncorhynchus nerka (noun)
small salmon with red flesh; found in rivers and tributaries of the northern Pacific and valued as food; adults die after spawning	small salmon with red flesh; found in rivers and tributaries of the northern Pacific and valued as food; adults die after spawning