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: weather 
Words: raining, sunny, fair, ghostly, windy
Example Output: ghostly

Example Input: Category: bird 
Words: crane, hoist, egret, tackle, ostrich
Example Output: hoist

Example Input: Category: animal 
Words: pounce, bird, car, fly, grasshopper
Example Output:
car