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 status 
Words: board, bored, emotional supports, frustrated, fret
Example Output: board

Example Input: Category: moral characteristic 
Words: dishonest, ok, fair, mild, fine
Example Output: mild

Example Input: Category: bird 
Words: winch, duck, winch, crane, swallow
Example Output:
winch