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: moral characteristic 
Words: unprejudiced, unjust, milky, ok, fair
milky

Category: weather 
Words: raining, sunny, fair, ghostly, windy
ghostly

Category: direction 
Words: down, kind, forward, south, ground

kind