Synonyms to each other

analogue, ally, alter ego, analogon, associate, brother, close copy, close match, cognate, companion, complement, congenator, congener, coordinate, correlate, correlative, correspondent, counterpart, equivalent, fellow, image, kindred spirit, like, likeness, match, mate, near duplicate, obverse, one another, parallel, pendant, picture, reciprocal, reciprocatist, reciprocator, second self, similitude, simulacrum, sister, soul mate, such, suchlike, tally, the like of, the likes of, twin, apply, bind, bracket, connect, corelate, couple, draw a parallel, equate, identify, interrelate, link, parallelize, relate, relativize, the like