noun (n)

• a tart spicy quality(noun.attribute)

  Synonym:
  nip, piquance, piquantness, tang, tanginess, zest
  

  source: wordnet30
• the quality of being agreeably stimulating or mentally exciting(noun.attribute)

  Synonym:
  piquance, piquantness
  

  source: wordnet30
• The quality or state of being piquant.(noun)

  source: webster1913