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: consumer product 
Words: fearful, content, merchandise, shop, program
Example Output: fearful

Example Input: Category: activity 
Words: blow, waste away, sweet roll, whittle, fritter
Example Output: sweet roll

Example Input: Category: mode of transportation 
Words: bike, jog, dive, fly, car
Example Output:
dive