fellow

admirer, crush, steady

suitor, wooer

beloved, darling, dear, favorite, flame, honey, love, lover, significant other, soul mate, squeeze [slang], sweet, sweetheart, sweetie, sweetie pie, valentine

fancy man, gigolo

date, escort

groom, husband

fiancé, intended

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

master, mister, sir

buddy, buster

coordinate

coequal, counterpart, equal, equivalent, like, parallel, peer, rival

carbon copy, double, duplicate, facsimile, identical twin, likeness, mirror image, replica, ringer

analogue (or analog), similarity

analogue (or analog)

double, half, mate, twin

associate, colleague, companion, copartner, partner

competitor