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: police punishment 
Words: prison, fine, calm, money, suspension
Example Output: calm

Example Input: Category: animal 
Words: goat, stingray, tiger, hike, fish
Example Output: hike

Example Input: Category: aesthetic characteristic 
Words: medium, endure, fair, even, pale
Example Output:
endure