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 activity 
Words: stoop, crouch, bow, duck, dog

Answer: dog


Question: Category: poker 
Words: call, sail, deck, board, queen

Answer: sail


Question: Category: military rank 
Words: common, fighter, cadet, general, sargent

Answer:
common