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: physical activity 
Words: run, jump, autumn, fall, swim
Example Output: autumn

Example Input: Category: weather 
Words: fair, unprejudiced, raining, windy, endure
Example Output: unprejudiced

Example Input: Category: boats 
Words: crew, deck, gunwale, bridge, blind
Example Output:
blind