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: boxing terminology 
Words: glove, level, deck, corner, board
board

Category: police punishment 
Words: probation, jail, arrest, fine, beautiful
beautiful

Category: activity 
Words: dally, goodbye, fritter, whittle, dumpling

dumpling