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: shady activities 
Words: falsification, wrongful, rich, fudge, unlicensed
Example Output: rich

Example Input: Category: mode of transportation 
Words: dive, fly, soar, jog, wave
Example Output: dive

Example Input: Category: type of sandwich 
Words: club, burger, bacon, clan, grilled cheese
Example Output:
clan