noun (n)

• a festive merry feeling(noun.feeling)

  Synonym:
  gaiety
  

  source: wordnet30
• a disposition to find (or make) causes for amusement(noun.attribute)

  Example:
  Her playfulness surprised me.
  

  Synonym:
  fun
  

  source: wordnet30
• activities that are enjoyable or amusing(noun.act)

  Synonym:
  fun, merriment
  

  source: wordnet30