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: kitchenware 
Words: metal, glass, knifer, dish, cup
Example Output: metal

Example Input: Category: location (proximity) 
Words: beside, closest, close, adjacent, shut
Example Output: shut

Example Input: Category: physical property 
Words: obese, heavy, area, chunky, fat
Example Output:
heavy