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Who

/huː/

Used to ask about the identity of a person or to refer to someone previously mentioned.

Synonyms:

This word has no synonyms

Who are you?

There will be no doubt about who killed the King.

And I, who of his colour was aware, Said:

Originates from Old English hwā, related to Old High German hwer, and ultimately from Proto-Indo-European root *kwo-.

2511 mentions per 1 million words

Very Often

Hint: Frequency according to COCA