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: animal 
Words: walk, flap, fish, fly, bats
Example Output: flap

Example Input: Category: animal 
Words: dangle, fly, run, car, pounce
Example Output: car

Example Input: Category: emotional status 
Words: emotional upsets, unhappy, down, lower, miserable
Example Output:
lower