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: bird 
Words: dump truck, tackle, crane, hoist, davit
Example Output: dump truck

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

Example Input: Category: emotional display 
Words: love, identity, cub, fawn, social
Example Output:
cub