Oncorhynchus keta vs chum salmon

Oncorhynchus keta and chum salmon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Oncorhynchus keta	Yes	No	No	No
chum salmon	Yes	No	No	No

As nouns, Oncorhynchus keta and chum salmon are synonyms defined as:

Oncorhynchus keta and chum salmon: a large Pacific salmon with small spots on its back; an important food fish

Other synonyms of Oncorhynchus keta include chum.

Oncorhynchus keta (noun)	chum salmon (noun)
a large Pacific salmon with small spots on its back; an important food fish	a large Pacific salmon with small spots on its back; an important food fish