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opposite number
THESAURUS
opposite number
antipode, antipodes, antipole, antithesis, antonym, coequal, compeer, complement, contra, converse, coordinate, counter, counterbalance, countercheck, counterpart, counterpoint, counterpoise, counterpole, counterterm, cousin, ditto, equal, equipollent, equivalent, fellow, foil, inverse, like, match, mate, obverse, offset, opposite, parallel, peer, reverse, rival, setoff, tally, the contrary, the other side, twin, vis-a-visFor further exploring for "opposite number" in Webster Dictionary Online