noun (n)

• a joke that seems extremely funny(noun.communication)

  Synonym:
  belly laugh, riot, scream, sidesplitter, thigh-slapper, wow
  

  source: wordnet30
• monkey of tropical South American forests having a loud howling cry(noun.animal)

  Synonym:
  howler monkey
  

  source: wordnet30
• a glaring blunder(noun.act)

  source: wordnet30
• One who howls.(noun)

  source: webster1913