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: heavy, protein, fat, sugars, area
Example Output: area

Example Input: Category: animal 
Words: pounce, fly, swim, walk, walk
Example Output: walk

Example Input: Category: fried food 
Words: skin, croquet, doughnut, fritter, whittle
Example Output:
whittle