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: mode of transportation 
Words: spider, fly, train, jog, car
Example Output: spider

Example Input: Category: bird 
Words: dump truck, tackle, crane, hoist, davit
Example Output: dump truck

Example Input: Category: chocolate food 
Words: heavy, fix, fudge, rich, molasses
Example Output:
fix