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: mode of transportation 
Words: beetle, fly, soar, bus, car

Answer: beetle


Question: Category: emotional status 
Words: sliding, down, emotionalities, remorseful, emotional upsets

Answer: sliding


Question: Category: bird 
Words: derrick, hoist, swift, neck, crane

Answer:
hoist