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: aesthetic characteristic 
Words: well, windy, even, fair, level
Example Output: windy

Example Input: Category: geographical property 
Words: horizontal, hotel, flat, lined, smooth
Example Output: hotel

Example Input: Category: elements 
Words: fire, cool, blaze, ground, hire
Example Output:
hire