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.

Example Input: Category: chocolate food 
Words: fudge, cream, replace, cookies, brownies
Example Output: replace

Example Input: Category: weather 
Words: brisk, ghostly, windy, fair, deal
Example Output: ghostly

Example Input: Category: corporate 
Words: firm, unyielding, common, sustainability, concerted
Example Output:
unyielding