An interrogative pronoun asks a question. They are exactly the same words as a relative pronoun but relative pronouns do not ask a question.
Who is the teacher?
What is for supper?
Note: the following sentence has a relative pronoun, not an interrogative pronun.
I love books which speak well of liberty.
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Greek:
In Greek, the interrogative pronoun is exactly like the indefinite pronoun except the interrogative pronoun always has an accent on the first syllable.
Interrogative Pronoun, τίς, τί, who, what?
Hebrew:
See the presentation here and the video here.
