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: physical activity 
Words: bend, duck, goose, jog, crouch
Example Output: goose

Example Input: Category: animal 
Words: train, fly, jump, leap, grasshopper
Example Output: train

Example Input: Category: consumer product 
Words: jealous, clothing, thing, shop, content
Example Output:
jealous