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Pronoun: who  hoo
  1. What or which person or persons?
    "who gave you the book?"
  2. The person or persons that; the one that
    "I'm the one who bought it"
Noun: WHO
  1. A United Nations agency to coordinate international health activities and to help governments improve health services
    - World Health Organization, W.H.O., World Health Organisation [Brit]

Type of: UN agency, United Nations agency

Encyclopedia: Who, What, Where, Ed