chum vs friend

chum and friend both are nouns.

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

As nouns, friend is a hypernym of chum; that is, friend is a word with a broader meaning than chum:

chum (noun)	friend (noun)
a large Pacific salmon with small spots on its back; an important food fish	a person you know well and regard with affection and trust
bait consisting of chopped fish and fish oils that are dumped overboard to attract fish	a person with whom you are acquainted
a close friend who accompanies his buddies in their activities	an associate who provides cooperation or assistance
	a person who backs a politician or a team etc.