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: body part 
Words: heel, shin, pound, finger, foot

Answer: pound


Question: Category: guitar part 
Words: frustrated, amp, string, fret, headstock

Answer: frustrated


Question: Category: fried food 
Words: fritter, doughnut, waste away, dumpling, fried

Answer:
waste away