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, lower, emotional upsets, below, falling

Answer: emotional upsets


Question: Category: physical property 
Words: large, fat, capacitance, calories, ugly

Answer: calories


Question: Category: social gathering 
Words: club, outing, cinema, group, lettuce

Answer:
lettuce