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: medium, just, light, ghostly, fair
Example Output: just

Example Input: Category: aesthetic characteristic 
Words: ticket, fine, bright, detailed, exquisite
Example Output: ticket

Example Input: Category: physical property 
Words: bulky, skinny, carbs, absorption, fat
Example Output:
carbs