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.

Example Input: Category: weather 
Words: brisk, ghostly, windy, fair, deal
Example Output: ghostly

Example Input: Category: direction 
Words: down, opposite of up, sliding, forward, emotional state
Example Output: emotional state

Example Input: Category: nutritional value 
Words: fat, calories, thin, salt, vitamin c
Example Output:
thin