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: boxing terminology 
Words: deck, corner, blocking, call, box
Example Output: call

Example Input: Category: emotional status 
Words: nervous, frustrated, fret, jack, concerned
Example Output: jack

Example Input: Category: secretary duty 
Words: answer calls, image, organize, file, correspondence
Example Output:
image