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: nutritional value 
Words: vitamin c, salt, sugar, fat, big boned
Example Output: big boned

Example Input: Category: physical activity 
Words: sprint, get down, cow, duck, bow
Example Output: cow

Example Input: Category: moral characteristic 
Words: deal, well, dishonest, fair, loyal
Example Output:
deal