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: boxing terminology 
Words: corner, fold, deck, knockout, level
Example Output: fold

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

Example Input: Category: animal 
Words: trap, dolphin, fish, goat, cat
Example Output:
trap