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: cockroach, leap, drive, swim, fly

Answer: drive


Question: Category: animal 
Words: trap, dog, fish, tiger, horse

Answer: trap


Question: Category: boats 
Words: rudder, bow, pack, crew, deck

Answer:
pack