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: window material 
Words: plastic, woodwork, glass, bowl, spyhole
Example Output: bowl

Example Input: Category: police punishment 
Words: acceptable, fine, hearing, jail time, probation
Example Output: acceptable

Example Input: Category: guitar part 
Words: fret, board, emotional upsets, headstock, pick
Example Output:
emotional upsets