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: military rank 
Words: sargent, ordinary, captain, colonel, general
Example Output: ordinary

Example Input: Category: moral characteristic 
Words: unprejudiced, unjust, milky, ok, fair
Example Output: milky

Example Input: Category: nutritional value 
Words: fat, angular momentum, sugars, heavy, iron
Example Output:
angular momentum