mate

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

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

soul mate

bridegroom, groom, husband, man, mister, old man

bride, helpmate, helpmeet, lady, wife