Dispute, quarrel, squabble, disagreement, difference of opinion, dissension; discord, friction, strife, antagonism, antipathy, ill will, bad blood, hostility, falling-out, disputation, contention;
clash, altercation, shouting match, exchange, war of words;
tussle, fracas, affray, wrangle, tangle, passage of/at arms, battle royal, feud, schism
"the industrial conflicts of the 1890s"