accident, antagonism, antipathy, antithesis, appulse, backlash, bad blood, belligerence, blow, brunt, bulldozing, bulling, bump, calamity, cannon, carambole, carom, casualty, cataclysm, catastrophe, clash, clashing, competition, concussion, conflict, confrontation, confutation, contention, contradiction, contradistinction, contraindication, contraposition, contrariety, contrariness, contrast, contretemps, counteraction, counterposition, counterworking, crack-up, crankiness, crash, cross-purposes, crotchetiness, crump, crunch, demolishment, despitefulness, destruction, dilapidation, disaccord, disagreement, disaster, discrepancy, dissension, dissent, encounter, enmity, fractiousness, friction, grief, hammering, hate, hatred, hostility, ill hap, impact, impingement, inconsistency, inimicalness, interference, jar, jolt, kick, malevolence, malice, malignity, mauling, meeting, misadventure, mischance, misfortune, mishap, nasty blow, near-miss, negativeness, nonconformity, noncooperation, obstinacy, onslaught, oppositeness, opposition, opposure, oppugnance, oppugnancy, percussion, perverseness, perversity, pileup, polarity, quarrelsomeness, ramming, reaction, recalcitrance, recoil, refractoriness, renitency, repercussion, repugnance, resistance, revolt, rivalry, ruin, shipwreck, shock, showdown, sideswipe, sledgehammering, smash, smash-up, smashing, smashup, spite, spitefulness, staggering blow, swimming upstream, thrusting, tragedy, uncooperativeness, vying, whomp, wreck