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: picnic, open-faced, club, grilled cheese, lettuce
Example Output: picnic

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

Example Input: Category: guitar part 
Words: fret, strap lock, chord, truss rod, emotionalities
Example Output:
emotionalities