Synonyms for Discord (same or very similar meaning)
WordNet sense 1 (lack of agreement or harmony):
strifeWordNet sense 2 (disagreement among those expected to cooperate):
dissensionWordNet sense 3 (a harsh mixture of sounds):
discordanceWordNet sense 4 (be different from one another):
disagree, disaccordFrom the ODE community, based on WordNetadd/edit