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 activity 
Words: stoop, crouch, bow, duck, dog
Example Output: dog

Example Input: Category: police punishment 
Words: prime, fine, jail, suspension, well
Example Output: well

Example Input: Category: aesthetic characteristic 
Words: neat, there, fine, bright, suspension
Example Output:
suspension