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: swim, dive, fly, car, bee
Example Output: car

Example Input: Category: weather 
Words: brisk, ghostly, windy, fair, deal
Example Output: ghostly

Example Input: Category: construction 
Words: davit, windlass, winch, crane, concrete pourer
Example Output:
davit