disorder - a disturbance of the peace or of public order

disagreement - the speech act of disagreeing or arguing or disputing

confrontation - discord resulting from a clash of ideas or opinions

variance, division - discord that splits a group

dissonance - disagreeable sounds

strife - bitter conflict; heated often violent dissension

be - have the quality of being; (copula, used with an adjective or a predicate noun); "John is rich"; "This is not a good answer"