friend

a person you know well and regard with affection and trust; "he was my best friend at the university"

an associate who provides cooperation or assistance; "he's a good ally in fight"

a person with whom you are acquainted; "I have trouble remembering the names of all my acquaintances"; "we are friends of the family"

a person who backs a politician or a team etc.; "all their supporters came out for the game"; "they are friends of the library"

a member of the Religious Society of Friends founded by George Fox (the Friends have never called themselves Quakers)