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: down, emotional upsets, disgusted, shameful, sliding
Example Output: sliding

Example Input: Category: employment activity 
Words: promote, ice, retire, ban, fire
Example Output: ice

Example Input: Category: elements 
Words: instruct, fire, flame, burn, air
Example Output:
instruct