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: bird 
Words: dump truck, tackle, crane, hoist, davit

Answer: dump truck


Question: Category: physical property 
Words: obese, fat, vitamin c, heavy, thin

Answer: vitamin c


Question: Category: emotional display 
Words: paw, kitten, swoon, follow, fawn

Answer:
kitten