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: type of sandwich 
Words: club, open-faced, convention, doorstep, roll

Answer: convention


Question: Category: bird 
Words: winch, swift, crane, hoist, ostrich

Answer: winch


Question: Category: boxing terminology 
Words: fight, galley, caution, deck, corner

Answer:
galley