accost, acrimonious, adversary, affray, altercation, animosity, animus, antagonism, antagonistic, arbitrator, besiege, bicker, combatants, combative, contend, contest, controversial, dialectic, discordant, dispute, dissonance, embroil, enmity, estranged, fracas, fractious, harassment, hector, hostility, impasse, incendiary, incensed, intransigent, irate, martyrdom, mediator, nemesis, ombudsman, persecute, pugnacious, quell, rancor, rebuttal, recalcitrant, remand, reprisal, repulse, retaliate, retaliation, retaliatory, revenge, ruthless, salvo, schism, shrapnel, skirmish, traitor, trounce, truculent, vendetta, wrangle