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: jog, jump, fish, fly, bats
Example Output: jog

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

Example Input: Category: physical activity 
Words: crouch, sprint, duck, squat, sheep
Example Output:
sheep