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: outdoor sport activity 
Words: fish, hike, hunting, row, dog

Answer: dog


Question: Category: mode of transportation 
Words: bus, fly, jog, beetle, drive

Answer: beetle


Question: Category: aesthetic characteristic 
Words: level, fair, milky, tangle, cool

Answer:
tangle