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: date status 
Words: current, blue, detestings, up to the moment, history
Example Output: blue

Example Input: Category: measurement unit 
Words: ounce, ear, inch, foot, milimeter
Example Output: ear

Example Input: Category: boxing terminology 
Words: blocking, corner, deck, fight, hearts
Example Output:
hearts