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: personal characteristic 
Words: freezing, calm, positive, cool, popular

Answer: freezing


Question: Category: baby animals 
Words: fawn, deer, buck, kitten, cajole

Answer: cajole


Question: Category: employment activity 
Words: replace, recruit, retire, fire, cool

Answer:
cool