Synonyms and related words :
ally, alter ego, analogon, analogue, associate, brother, clone, close copy, close match, coequal, cognate, companion, compeer, complement, congenator, congener, coordinate, correlate, correlative, correspondent, ditto, double, dupe, duplicate, duplication, each other, equal, equipollent, equivalent, facsimile, fellow, image, kindred spirit, like, likeness, match, mate, model, near duplicate, obverse, one another, opposite number, parallel, peer, pendant, picture, quadruplicate, reciprocal, reciprocatist, reciprocator, repetition, replica, replication, representation, reproduction, rival, second self, similitude, simulacrum, sister, soul mate, such, suchlike, tally, the like of, the likes of, triplicate, twin, vis-a-vis