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: acceptable, fine, hearing, jail time, probation
acceptable

Category: nutritional value 
Words: heavy, fat, protein, obese, carbs
obese

Category: bird 
Words: hummingbird, hoist, crane, digger, swallow

digger