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: money, fine, ticket, level, suspension
Example Output: level

Example Input: Category: elements 
Words: let go, flame, inferno, fire, water
Example Output: let go

Example Input: Category: physical activity 
Words: summer, bend, fall, tumble, jump
Example Output:
summer