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: aesthetic characteristic 
Words: fair, unprejudiced, level, tone, milky
Example Output: unprejudiced

Example Input: Category: animal 
Words: fly, dangle, bee, jump, flap
Example Output: flap

Example Input: Category: physical activity 
Words: dodge, bend, dog, hike, duck
Example Output:
dog