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: shady activities 
Words: replace, unwarranted, pie, fudge, unlicensed
pie

Category: police punishment 
Words: classy, probation, custody, fine, flyaway
classy

Category: temperature 
Words: relaxing, tropical, unruffled, cool, refreshing

unruffled