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: social gathering 
Words: place, bar, doorstep, club, outing

Answer: doorstep


Question: Category: weather 
Words: mild, warm, fine, fair, deal

Answer: fine


Question: Category: physical activity 
Words: cow, duck, push, squat, crouch

Answer:
cow