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: emotional display 
Words: buck, identity, culture, fawn, pester
Example Output: buck

Example Input: Category: activity 
Words: divide, croquet, fritter, squander, spend
Example Output: croquet

Example Input: Category: aesthetic characteristic 
Words: ticket, fine, bright, detailed, exquisite
Example Output:
ticket