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: emotional status 
Words: ashamed, down, emotional upsets, disgusted, ground
ground

Category: food 
Words: blunt, entree, frank, wienerwurst, bun
blunt

Category: aesthetic characteristic 
Words: ok, fair, medium, variety, cool

ok