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: windlass, crane, dump truck, pelican, digger

Answer: pelican


Question: Category: temperature 
Words: cold, hot, cool, popular, relaxing

Answer: popular


Question: Category: secretary duty 
Words: organize, answer calls, image, schedule appointments, file

Answer:
image