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: animal 
Words: fly, dangle, bee, jump, flap

Answer: flap


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

Answer: dolphin


Question: Category: boxing terminology 
Words: canvas, ring, apron, crew, deck

Answer:
crew