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: grilled cheese, place, club, dance hall, meeting

Answer: grilled cheese


Question: Category: outdoor sport activity 
Words: swim, wrestle, fish, canyoning, horse

Answer: horse


Question: Category: aesthetic characteristic 
Words: well, fair, flaxen, light, ok

Answer:
ok