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: shady activities 
Words: cookies, wrongful, fudge, smuggled, smear
Example Output: cookies

Example Input: Category: bird 
Words: goose, hoist, neck, swallow, crane
Example Output: hoist

Example Input: Category: physical property 
Words: salt, pasty, thin, heavy, fat
Example Output:
salt