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: physical property 
Words: sugars, fat, thin, large, angular momentum

Answer: sugars


Question: Category: employment activity 
Words: promote, ice, retire, ban, fire

Answer: ice


Question: Category: social gathering 
Words: group, convention, open-faced, bar, club

Answer:
open-faced