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: construction 
Words: tackle, crane, digger, sandpiper, dump truck

Answer: sandpiper


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

Answer: carbs


Question: Category: outdoor sport activity 
Words: whale, fish, raft, hiking, kayak

Answer:
whale