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: bird 
Words: neck, tackle, derrick, crane, steam roller
Example Output: steam roller

Example Input: Category: consumer product 
Words: content, clothing, activity, file, excited
Example Output:
excited