friend vs pal

friend and pal both are nouns.

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

As nouns, pal is a hyponym of friend; that is, pal is a word with a more specific, narrower meaning than friend:

friend (noun)	pal (noun)
a person you know well and regard with affection and trust	a close friend who accompanies his buddies in their activities
a person with whom you are acquainted
an associate who provides cooperation or assistance
a person who backs a politician or a team etc.

friend (verb)	pal (verb)
	become friends; act friendly towards