who

noun

1. a United Nations agency to coordinate international health activities and to help governments improve health services

Definition categories: group

pronoun

1. (interrogative pronoun) What person or people; which person or people (used in a direct or indirect question).

- Who is that? (direct question)I don't know who it is. (indirect question)

2. (relative pronoun) The person or people that.

- It was a nice man who helped us.