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: boxing terminology 
Words: deck, gunwale, level, tko, jab

Answer: gunwale


Question: Category: aesthetic characteristic 
Words: well, windy, even, fair, level

Answer: windy


Question: Category: mode of transportation 
Words: train, drive, spider, fly, flutter

Answer:
spider