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: employment activity 
Words: sack, inferno, promote, empower, fire

Answer: inferno


Question: Category: aesthetic characteristic 
Words: luke, fair, variety, tone, well

Answer: luke


Question: Category: kitchenware 
Words: glass, colander, dish, plate, panel

Answer:
panel