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: fish, iguana, canyoning, hamster, horse
Example Output: canyoning

Example Input: Category: direction 
Words: down, backward, up, downward, shameful
Example Output: shameful

Example Input: Category: military rank 
Words: general, admiral, lieutenant, universal, colonel
Example Output:
universal