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: activity 
Words: blow, waste away, sweet roll, whittle, fritter

Answer: sweet roll


Question: Category: alcoholic drinks 
Words: gin, tonic, rum, spider, tequila

Answer: spider


Question: Category: guitar part 
Words: emotional upsets, fret, truss rod, headstock, jack

Answer:
emotional upsets