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: consumer product 
Words: fearful, content, merchandise, shop, program
Example Output: fearful

Example Input: Category: police punishment 
Words: flyaway, jail time, ok, arrest, fine
Example Output: ok

Example Input: Category: elements 
Words: water, fire, ice, scold, air
Example Output:
scold