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: weather 
Words: equitable, fair, windy, cold, raining
equitable

Category: poker 
Words: fold, suits, deck, sail, hearts
sail

Category: direction 
Words: down, ground, emotional upsets, backward, south

emotional upsets