noun (n)

• a conflict of people's opinions or actions or characters(noun.state)

  Synonym:
  disagreement, dissension
  Antonym:
  accord, agreement
  

  source: wordnet30
• the auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience(noun.cognition)

  Synonym:
  noise, racket
  

  source: wordnet30
• disagreeable sounds(noun.attribute)

  Antonym:
  harmony
  

  source: wordnet30
• A mingling of discordant sounds; an inharmonious combination of sounds; discord.(noun)

  source: webster1913