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: elements 
Words: ice, air, fire, hire, combustion
Example Output: hire

Example Input: Category: aesthetic characteristic 
Words: handsome, detailed, calm, there, fine
Example Output: calm

Example Input: Category: animal 
Words: waggle, fly, swim, run, jog
Example Output:
jog