noun (n)

• person who makes a gift of property(noun.person)

  Synonym:
  bestower, conferrer, giver, presenter
  

  source: wordnet30
• (medicine) someone who gives blood or tissue or an organ to be used in another person (the host)(noun.person)

  source: wordnet30
• One who gives or bestows; one who confers anything gratuitously; a benefactor.(noun)

  source: webster1913