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 activity 
Words: run, jump, autumn, fall, swim

Answer: autumn


Question: Category: outdoor sport activity 
Words: kayak, raft, fish, canyoning, dolphin

Answer: dolphin


Question: Category: boats 
Words: hull, box, rudder, gunwale, deck

Answer:
box