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: loyal, medium, ghostly, tone, fair
loyal

Category: weather 
Words: fair, unprejudiced, raining, windy, endure
unprejudiced

Category: weather 
Words: light, fair, clime, make the grade, deal

light