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: temperature 
Words: cold, hot, cool, popular, relaxing

Answer: popular


Question: Category: mode of transportation 
Words: spider, fly, train, jog, car

Answer: spider


Question: Category: animal 
Words: pounce, car, bats, fly, grasshopper

Answer:
car