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: moral characteristic 
Words: stern, frank, brash, loyalty, goodies
Example Output: goodies

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

Example Input: Category: boats 
Words: queen, head, deck, crew, bridge
Example Output:
queen