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: military rank 
Words: regular, major, general, soldier, cadet
Example Output: regular

Example Input: Category: corporate 
Words: corporation, firm, synergy, tough, concerted
Example Output: tough

Example Input: Category: guitar part 
Words: fret, crying, strap lock, board, neck
Example Output:
crying