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: boxing terminology 
Words: deck, corner, blocking, call, box
Example Output: call

Example Input: Category: chocolate food 
Words: cake, fudge, rich, invent, cream
Example Output: invent

Example Input: Category: aesthetic characteristic 
Words: fine, flyaway, exquisite, neat, bright
Example Output:
flyaway