bidirectional, bifold, binary, clone, counterpart, couple, dichotomous, doubly, dual, dualistic, duo, duplex, duplicate, dyad, lookalike, matched, pair, paired, replica, replicate, second, twain, twice, twin, two-family, two-fold, two-part, two-seater, twofold, twosome
Start by entering a word to find its synonyms.