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: physical activity 
Words: sprint, cow, duck, jog, squat
Example Output: cow

Example Input: Category: aesthetic characteristic 
Words: variety, fair, alright, pale, flaxen
Example Output: alright

Example Input: Category: aesthetic characteristic 
Words: make the grade, light, fair, flaxen, level
Example Output:
make the grade