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: type of sandwich 
Words: dagwood, club, doorstep, hamburger, community
Example Output: community

Example Input: Category: police punishment 
Words: flyaway, jail time, ok, arrest, fine
Example Output: ok

Example Input: Category: bird 
Words: hummingbird, crane, ostrich, excavator, parrot
Example Output:
excavator