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: aesthetic characteristic 
Words: loyal, medium, ghostly, tone, fair
loyal

Category: social gathering 
Words: club, bar, dance hall, discothek, roll
roll

Category: fried food 
Words: pastry, patty, waste, pie, fritter

waste