The best answer would be Plumber : Wrench
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So you see, the barber use the scissors. The scissors are a tool of his. A plumber uses the wrench, because the wrench is his tool. A master doesn't physically use his apprentice. The apprentice is used verbally, not physically. The chef is related to his restaurant, but does not use it. The faculty is not a tool for the teacher.
Best of luck,
