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 property 
Words: bulky, angular momentum, pasty, fat, big
Example Output: big

Example Input: Category: weather 
Words: mild, warm, fine, fair, deal
Example Output: fine

Example Input: Category: physical activity 
Words: duck, mallet, hike, jog, fall
Example Output:
mallet