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: bird 
Words: swift, tackle, pelican, crane, hoist

Answer: hoist


Question: Category: body part 
Words: foot, knee, eye, leg, ounce

Answer: ounce


Question: Category: animal 
Words: bike, bats, bird, fly, fish

Answer:
bike