antagonism, anteposition, antipathy, antipode, antipodes, antipole, antonym, clashing, collision, con, conflict, confrontation, confrontment, contention, contra, contradiction, contradictory, contradistinction, contraindication, contraposition, contrariety, contrary, contrast, converse, counter, counterbalance, countercheck, counterpoint, counterpoise, counterpole, counterposition, counterterm, cross-purposes, disagreement, discrepancy, foil, hostility, inconsistency, inimicalness, inverse, obverse, offset, opposing, opposite, opposite number, oppositeness, opposition, opposure, oppugnance, oppugnancy, perversity, polar opposition, polarity, polarization, posing against, repugnance, reverse, setoff, showdown, the contrary, the other side, vis-a-vis