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: iron, heavy, vitamin c, fat, brittleness
Example Output: brittleness

Example Input: Category: shady activities 
Words: falsification, wrongful, rich, fudge, unlicensed
Example Output: rich

Example Input: Category: activity 
Words: fritter, croquet, squander, whittle, blow
Example Output:
croquet