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: kitchenware 
Words: spoon, glass, bowl, lead, cup

Answer: lead


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

Answer: sweet roll


Question: Category: type of rigidity 
Words: taut, hard, concerted, tough, firm

Answer:
concerted