who

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who /ˈhuː/ pronoun
who
/ˈhuː/
pronoun
Learner's definition of WHO
: what or which person or people used when you do not know the name or identity of a person or group of people that you are talking about or asking about
used to question a person's character or authority
used in questions that are meant to say that no one would or would not do something, know something, etc.
Usage see: whom
Usage see: whom
used after a noun or pronoun to show which group of people you are talking about
used to introduce an additional statement about someone who has already been mentioned

who's who

or who is who : information about the people who make up a group
: a list of the names of the important and well-known people in a particular field
: the important and well-known people in a particular field
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