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: direction 
Words: down, backward, up, downward, shameful

Answer: shameful


Question: Category: elements 
Words: ground, replace, combustion, flame, fire

Answer: replace


Question: Category: consumer product 
Words: jealous, content, merchandise, jewelry, shop

Answer:
jealous