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.

Category: police punishment 
Words: probation, suspension, jail, fine, attractive
attractive

Category: window material 
Words: glass, spyhole, handle, coating, knive
knive

Category: nutritional value 
Words: sugars, calories, chunky, fat, heavy

chunky