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: outdoor sport activity 
Words: fish, hike, hunting, row, dog

Answer: dog


Question: Category: measurement unit 
Words: meter, inch, foot, heel, pound

Answer: heel


Question: Category: construction 
Words: digger, neck, crane, dump truck, winch

Answer:
neck