amigo vs friend

amigo and friend both are nouns.

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

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

amigo (noun)	friend (noun)
a friend or comrade	a person you know well and regard with affection and trust
	a person with whom you are acquainted
	an associate who provides cooperation or assistance
	a person who backs a politician or a team etc.