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: corner, fold, deck, knockout, level
fold

Category: police punishment 
Words: hearing, firstrate, alert, custody, fine
alert

Category: moral characteristic 
Words: equitable, alright, level, fair, unprejudiced

level