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: activity 
Words: blow, waste away, sweet roll, whittle, fritter
sweet roll

Category: physical activity 
Words: summer, roll, plummet, fall, exercise
summer

Category: police punishment 
Words: fine, ticket, flyaway, jail, hot

hot