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: animal 
Words: pounce, fly, swim, walk, walk
Example Output: walk

Example Input: Category: moral characteristic 
Words: variety, fine, fair, ok, balanced
Example Output: variety

Example Input: Category: boats 
Words: deck, sail, lifeline, head, jab
Example Output:
jab