noun (n)

• an incidental benefit awarded for certain types of employment (especially if it is regarded as a right)(noun.possession)

  Synonym:
  fringe benefit, perk
  

  source: wordnet30
• a right reserved exclusively by a particular person or group (especially a hereditary or official right)(noun.attribute)

  Synonym:
  exclusive right, prerogative, privilege
  

  source: wordnet30
• Something gained from a place or employment over and above the ordinary salary or fixed wages for services rendered; especially, a fee allowed by law to an officer for a specific service.(noun)

  source: webster1913