chum vs chum salmon

chum and chum salmon both are nouns.

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

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

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

Other synonyms of chum include Oncorhynchus keta.

chum (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
bait consisting of chopped fish and fish oils that are dumped overboard to attract fish
a close friend who accompanies his buddies in their activities