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: date status 
Words: postponed, timely, early, current, jetstream
Example Output: jetstream

Example Input: Category: physical activity 
Words: stoop, crouch, bow, duck, dog
Example Output: dog

Example Input: Category: emotional status 
Words: angry, board, fret, emotional state, bored
Example Output:
board