Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.
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Question: Category: animal 
Words: bus, leap, spider, run, fly

Answer: bus


Question: Category: construction 
Words: hoist, crane, excavator, egret, derrick

Answer: egret


Question: Category: window material 
Words: coating, spyhole, dish, glass, metal

Answer:
dish