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: emotional status 
Words: board, bored, emotional supports, frustrated, fret
Example Output: board

Example Input: Category: secretary duty 
Words: order office supplies, sort mail, file, program, type
Example Output: program

Example Input: Category: direction 
Words: falling, down, emotionalities, right, downward
Example Output:
emotionalities