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: trustworthy, variety, tone, ghostly, fair
trustworthy

Category: physical activity 
Words: drop, fall, leaves, bend, exercise
leaves

Category: food 
Words: blunt, sausage, hot dog, frank, wienerwurst

blunt