friend vs end man

friend and end man both are nouns.

Word	Noun	Adjective	Verb	Adverb
friend	Yes	No	No	No
end man	Yes	No	No	No

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

friend (noun)	end man (noun)
a person you know well and regard with affection and trust	a man at one end of a row of people
a person with whom you are acquainted	a man at one end of line of performers in a minstrel show; carries on humorous dialogue with the interlocutor
an associate who provides cooperation or assistance
a person who backs a politician or a team etc.