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: food 
Words: blunt, entree, frank, wienerwurst, bun
Example Output: blunt

Example Input: Category: boats 
Words: deck, call, galley, bridge, stern
Example Output: call

Example Input: Category: food 
Words: entree, frank, vittles, sausage, fortitude
Example Output:
fortitude