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: moral characteristic 
Words: unprejudiced, unjust, milky, ok, fair
Example Output: milky

Example Input: Category: geographical property 
Words: studio, hill, flat, even, horizontal
Example Output: studio

Example Input: Category: emotional status 
Words: annoyed, penalty, calm, fine, content
Example Output:
penalty