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: classy, probation, custody, fine, flyaway
Example Output: classy

Example Input: Category: outdoor sport activity 
Words: kayak, raft, fish, canyoning, dolphin
Example Output: dolphin

Example Input: Category: physical property 
Words: fat, sugars, bulky, area, absorption
Example Output:
sugars