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: aesthetic characteristic 
Words: cool, trustworthy, milky, fair, well
Example Output: trustworthy

Example Input: Category: window material 
Words: plastic, woodwork, glass, bowl, spyhole
Example Output: bowl

Example Input: Category: bird 
Words: crane, concrete pourer, goose, hoist, duck
Example Output:
concrete pourer