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: elements 
Words: fire, retire, ice, air, earth

Answer: retire


Question: Category: elements 
Words: fire, earth, water, blaze, recruit

Answer: recruit


Question: Category: secretary duty 
Words: file, motherboard, fax, reception, schedule appointments

Answer:
motherboard