From WordNet (r) 3.0 (2006):
discord
n 1: lack of agreement or harmony [syn: discord, strife]
2: disagreement among those expected to cooperate [syn:
discord, dissension]
3: a harsh mixture of sounds [syn: discordance, discord]
4: strife resulting from a lack of agreement [syn: discord,
discordance]
v 1: be different from one another [syn: disagree,
disaccord, discord] [ant: agree, check,
correspond, fit, gibe, jibe, match, tally]