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: physical property 
Words: fat, angular momentum, ugly, capacitance, fiber
Example Output: fiber

Example Input: Category: weather 
Words: 70, sunny, equitable, fair, tangle
Example Output: equitable

Example Input: Category: police punishment 
Words: ticket, fine, hearing, probation, classy
Example Output:
classy