Another word for duplicate
double, second, mate, match, twin, copy, facsimile, replica, reproduction, photocopy, carbon, carbon copy, ditto, likeness, counterpart, counterfeit, analogue, second edition, parallel, correlate, repetition, duplication, recurrence, Xerox (trademark), look-alike, chip off the old block*, ringer*, dead ringer*, clone*; see also copy, imitation 2, reproduction 2.
Another word for duplicateadjective
Composed of two parts or things:biform, binary, double, dual, duple, duplex, geminate, twofold. See part
Something closely resembling another:carbon copy, copy, facsimile, image, likeness, reduplication, replica, replication, reproduction, simulacrum. (Archaic) simulacre. (Law) counterpart. See same
One exactly resembling another:double, image, picture, portrait, spitting image. (Slang) ringer. See same
One of a matched pair of things:companion, counterpart, double, fellow, match, mate, twin. See same