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: medium, just, light, ghostly, fair
just

Category: moral characteristic 
Words: milky, fair, ok, loyal, unprejudiced
milky

Category: weather 
Words: stormy, clime, fair, windy, loyal

loyal