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: animal 
Words: hamster, fish, tiger, canyoning, sea turtle

Answer: canyoning


Question: Category: construction 
Words: hoist, crane, excavator, egret, derrick

Answer: egret


Question: Category: boats 
Words: head, gunwale, sail, deck, level

Answer:
level