Concurrent, Conjoint, Connect, Coordinate, Copy, Correlate, Correlative, Correspondent, Corresponding, Counterpart, Couple, Coupled, Dichotomous, Ditto, Double, Dual, Dualistic, Dupe, Duplex, Duplicate, Duplicated, Dyadic, Effigy, Equal, Equivalent, Facsimile, Fellow, Homonym, Icon, Idem, Identical, Idol, Image, Indistinguishable, Join, Joined, Joint, Like, Likeness, Link, Match, Matched, Matching, Mate, Miniature, Mirroring, Model, Mutual, Obverse, One, Pair, Paired, Parallel, Paralleling, Peer, Pendant, Photograph, Picture, Portrait, Reciprocal, Redouble, Reflection, Repeat, Replica, Replicate, Reproduce, Resemblance, Ringer, Rival, Rubbing, Same, Second, Secondary, Selfsame, Semblance, Shadow, Similar, Similitude, Accessory, Accompanying, Alike, Ally, Ambidextrous, Analogous, Analogue, Associate, Associated, Attendant, Attending, Bifurcated, Bilateral, Binary, Bipartisan, Bipartite, Brother, Clone, Cognate, Coincident, Collateral, Combine, Combined, Companion, Comparable, Complement, Concomitant, Simulacrum, Simultaneous, Sister, Such, Suchlike, Synonym, Tally, Trace, Tracing, Twain, Two, Twofold, Yoke