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: cool, trustworthy, milky, fair, well
trustworthy

Category: moral characteristic 
Words: light, unprejudiced, honorable, fair, unjust
light

Category: animal 
Words: dolphin, horse, hunt, fish, stingray

hunt