crony

colleague, coworker, equal, peer, workmate

accomplice, affiliate, ally, collaborator, confederate, half, partner

buddy, chum, confidant, familiar, friend, hearty, intimate, pal

countryman

classmate, housemate, messmate, playfellow, playmate, roommate (also roomie), schoolmate, shipmate, teammate

attendant, escort

hanger-on, leech, parasite

acquaintance

associate, cohort, colleague, companion, fellow, hearty, hobnobber, partner, peer, sport

blood brother, brother, main man, sister

abettor (also abetter), accomplice, ally, collaborator, confederate

pen pal

benefactor, supporter, sympathizer, well-wisher

friendly