Which and witch are homophones in English and are often confused; they are both pronounced /wɪtʃ/ but have different spellings and their meanings are completely different.
which

Which can be used as a determiner and a pronoun.
You use which in questions when there are two or more possible answers or alternatives.
Which are the ones you really like?
Which vitamin supplements are good value?
You can also use which at the beginning of a relative clause when specifying the thing that you are talking about or when giving more information about it.
He’s based in Banja Luka, which is the largest city in northern Bosnia.
He was put in a little room which had dust all over the bed.
Since we started in September we have raised fifty thousand pounds, which is pretty good going.
witch

In fairy stories, a witch is a woman who has evil magic powers. Witches often wear a pointed black hat, and have a pet black cat.
The witch laughed cruelly as her wand began to crackle and spark.
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