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: direction 
Words: up, down, sliding, shameful, right
Example Output: shameful

Example Input: Category: poker 
Words: fold, queen, deck, galley, call
Example Output: galley

Example Input: Category: mode of transportation 
Words: fly, eagle, swim, drive, train
Example Output:
eagle