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: shady activities 
Words: loosen, smuggled, chocolate, wrongful, fudge
Example Output: chocolate

Example Input: Category: boats 
Words: head, hull, knockout, deck, dock
Example Output: knockout

Example Input: Category: window material 
Words: glass, metal, panel, frame, bowl
Example Output:
bowl