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: shady activities 
Words: falsification, fib, invent, fudge, cupcake
Example Output: cupcake

Example Input: Category: elements 
Words: fire, earth, water, blaze, recruit
Example Output: recruit

Example Input: Category: moral characteristic 
Words: honest, brash, vittles, frank, concise
Example Output:
vittles