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: physical property 
Words: sugars, fat, thin, large, angular momentum
sugars

Category: direction 
Words: below, backward, melancholy, down, ground
melancholy

Category: type of sandwich 
Words: bacon, french toast, club, roll, outing

outing