In English texts and verbal communication, the word “who” is always used as a pronoun.
In all cases, the word “who” acts as a pronoun because it can take the place of a noun. It can be used to ask a question about which person, or it can also start the clause that provides additional details regarding someone. For instance, in the sample sentence below:
That is the woman who gave me the address.
The word “who” is used to introduce the clause that provides further information about the “woman.”
a. what or which person or people
- Who is that man?
b. used to introduce a clause giving further information about a person or people previously mentioned
- Christopher plays the teenager who killed his own parents.