instruction:
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.
question:
Category: weather 
Words: raining, sunny, fair, ghostly, windy
answer:
ghostly


question:
Category: type of sandwich 
Words: open-faced, hero, club, discothek, hamburger
answer:
discothek


question:
Category: aesthetic characteristic 
Words: ghostly, texture, fair, make the grade, light
answer:

make the grade