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: aesthetic characteristic 
Words: ghostly, milky, windy, fair, texture

Answer: windy


Question: Category: boxing terminology 
Words: canvas, tko, deck, joker, fight

Answer: joker


Question: Category: nutritional value 
Words: protein, skinny, big, fat, salt

Answer:
skinny