noun (n)

• a very attractive or seductive looking woman(noun.person)

  Synonym:
  beauty, dish, knockout, looker, lulu, mantrap, peach, ravisher, smasher, sweetheart
  

  source: wordnet30
• an unexpected and amazing event(noun.event)

  Example:
  The stunner was what happened on Saturday.
  

  source: wordnet30
• One who, or that which, stuns.(noun)

  source: webster1913