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: chocolate food 
Words: cake, cupcake, cream, smuggled, fudge
Example Output: smuggled

Example Input: Category: employment activity 
Words: ban, fire, empower, sack, ground
Example Output: ground

Example Input: Category: animal 
Words: goat, dolphin, raft, horse, fish
Example Output:
raft