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: weather 
Words: windy, stormy, fair, tone, tangle
Example Output: tone

Example Input: Category: boxing terminology 
Words: corner, fold, deck, knockout, level
Example Output: fold

Example Input: Category: personal characteristic 
Words: persistent, cool, assured, unflappalbe, chill
Example Output:
chill