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: dally, seperate, fritter, waste, fried
fried

Category: boats 
Words: lifeline, stern, fold, deck, rudder
fold

Category: police punishment 
Words: wispy, fine, custody, firstrate, mad

mad