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: direction 
Words: down, lower, emotional upsets, below, falling
Example Output: emotional upsets

Example Input: Category: employment activity 
Words: sack, inferno, promote, empower, fire
Example Output: inferno

Example Input: Category: store status 
Words: close, open, neighboring, shut, running.
Example Output:
neighboring