Which,
1. Used referring to something previously mentioned when introducing a clause giving further information.
2. Asking for information specifying one or more people or things from a definite set: "which are the best varieties of grapes?"; "which way is Bin Laden's house?"
Witch,
Noun: A woman thought to have evil magic powers. Witches are popularly depicted as wearing a black cloak and pointed hat, and flying on a broomstick.
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