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: corporate 
Words: corporation, firm, synergy, tough, concerted

Answer: tough


Question: Category: weather 
Words: 70, endure, decent, cold, fair

Answer: decent


Question: Category: date status 
Words: water, postponed, detests, current, do tests

Answer:
water