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: social gathering 
Words: club, group, meeting, grilled cheese, convention
Example Output: grilled cheese

Example Input: Category: moral characteristic 
Words: even, equitable, unprejudiced, fair, impartial
Example Output: even

Example Input: Category: bird 
Words: crane, sandpiper, hoist, windlass, goose
Example Output:
windlass