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: emotional status 
Words: worried, angry, jack, fret, emotional upsets
Example Output: jack

Example Input: Category: aesthetic characteristic 
Words: well, milky, variety, tone, fair
Example Output: well

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