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: aesthetic characteristic 
Words: honorable, fair, variety, milky, even
Example Output: honorable

Example Input: Category: moral characteristic 
Words: even, equitable, unprejudiced, fair, impartial
Example Output: even

Example Input: Category: elements 
Words: water, pay, air, earth, fire
Example Output:
pay