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: secretary duty 
Words: support, type, file, software, answer
Example Output: software

Example Input: Category: physical property 
Words: fat, angular momentum, ugly, capacitance, fiber
Example Output: fiber

Example Input: Category: shady activities 
Words: replace, unwarranted, pie, fudge, unlicensed
Example Output:
pie