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: weather 
Words: 70, mild, fair, dishonest, clime
Example Output: dishonest

Example Input: Category: secretary duty 
Words: answer calls, file, correspondence, document, fax
Example Output: document

Example Input: Category: geographical property 
Words: flat, hotel, hill, lined, valley
Example Output:
hotel