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: animal 
Words: goat, cat, fish, hamster, hunting
Example Output: hunting

Example Input: Category: moral characteristic 
Words: clime, fine, fair, trustworthy, unjust
Example Output: clime

Example Input: Category: emotional status 
Words: loveful, unhappy, emotional, down, up
Example Output:
up