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: submarine, group, club, roll, grilled cheese
Example Output: group

Example Input: Category: accomodation 
Words: even, townhome, level, flat, paved
Example Output: level

Example Input: Category: animal 
Words: horse, trap, tiger, sea turtle, fish
Example Output:
trap