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: bird 
Words: crane, concrete pourer, goose, hoist, duck
Example Output: concrete pourer

Example Input: Category: bird 
Words: ostrich, digger, sandpiper, crane, goose
Example Output: digger

Example Input: Category: weather 
Words: tangle, fair, color, deal, mild
Example Output:
color