An indefinite pronoun is a pronoun that refers to an unspecified being, object, or place. more
More indefinite pronouns: Another, Anybody, Anyone, Anything, Each, Either, Enough, Everybody, Everyone, Everything, Most, None, Some, Such.
The interrogative pronoun is spelled exactly like the indefinite pronoun except the interrogative pronoun always has an accent on the first syllable. (BBG 10.11)