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: season 
Words: winter, roll, spring, hiems, fall
Example Output: roll

Example Input: Category: window material 
Words: metal, handle, dish, glass, vinyl
Example Output: dish

Example Input: Category: aesthetic characteristic 
Words: flaxen, tone, fair, mild, size
Example Output:
mild