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: bird 
Words: winch, swallow, winch, crane, parrot
Example Output: winch

Example Input: Category: poker 
Words: fold, deck, board, call, knockout
Example Output: knockout

Example Input: Category: boats 
Words: galley, deck, punch, hull, stern
Example Output:
punch