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: poker 
Words: punch, pack, deck, check, fold
Example Output: punch

Example Input: Category: social gathering 
Words: meeting, cinema, club, group, submarine
Example Output: submarine

Example Input: Category: physical property 
Words: carbs, skinny, ugly, big boned, fat
Example Output:
carbs