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: boats 
Words: deck, call, galley, bridge, stern

Answer: call


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

Answer: doorstep


Question: Category: physical property 
Words: angular momentum, fat, calcium, brittleness, ugly

Answer:
calcium