noun

a serious disagreement or argument, typically a protracted one.

the eternal conflict between the sexes

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

verb

be incompatible or at variance; clash.

parents’ and children’s interests sometimes conflict

clash,be incompatible,be inconsistent,be incongruous,be in opposition,be at variance,vary,be at odds,be in conflict,come into conflict,differ,diverge,disagree,contrast,collide,contradictory,incompatible,inconsistent,irreconcilable,incongruous,contrary,opposite,opposing,opposed,antithetical,clashing,discordant,differing,different,divergent,discrepant,varying,disagreeing,contrasting,at odds,in opposition,at variance,oppugnant