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-vis