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: flyaway, jail time, ok, arrest, fine
ok

Category: personal characteristic 
Words: cold, positive, calm, assured, cool
cold

Category: boats 
Words: dock, stern, call, hull, deck

call