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.

Category: aesthetic characteristic 
Words: fine, custody, level, beautiful, attractive
custody

Category: boxing terminology 
Words: canvas, tko, deck, joker, fight
joker

Category: personal characteristic 
Words: funny, level, cool, calm, cold

cold