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: bird 
Words: neck, tackle, derrick, crane, steam roller

Answer: steam roller


Question: Category: bird 
Words: crane, pelican, egret, hummingbird, upraise

Answer: upraise


Question: Category: boats 
Words: sail, deck, fold, bow, galley

Answer:
fold