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: physical property 
Words: bulky, skinny, carbs, absorption, fat

Answer: carbs


Question: Category: boats 
Words: head, hull, knockout, deck, dock

Answer: knockout


Question: Category: military rank 
Words: common, private, sergeant, colonel, general

Answer:
common