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: boxing terminology 
Words: glove, level, deck, corner, board
Example Output: board

Example Input: Category: emotional status 
Words: worried, angry, jack, fret, emotional upsets
Example Output: jack

Example Input: Category: moral characteristic 
Words: balanced, fair, alright, just, mild
Example Output:
mild