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: type of sandwich 
Words: open-faced, team, roll, doorstep, club
Example Output: team

Example Input: Category: shady activities 
Words: unwarranted, mangle, cream, loosen, fudge
Example Output: cream

Example Input: Category: boxing terminology 
Words: deck, tko, box, glove, sail
Example Output:
sail