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: comfortable, pretty, there, fine, classy
Example Output: comfortable

Example Input: Category: physical property 
Words: large, obese, fat, chunky, fiber
Example Output: fiber

Example Input: Category: military rank 
Words: admiral, fighter, general, ordinary, cadet
Example Output:
ordinary