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: aesthetic characteristic 
Words: pretty, probation, neat, fine, level

Answer: probation


Question: Category: boats 
Words: crew, deck, rudder, suits, hull

Answer: suits


Question: Category: card games 
Words: spades, bourbon, blackjack, war, gin

Answer:
bourbon