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.

Category: moral characteristic 
Words: even, equitable, unprejudiced, fair, impartial
even

Category: corporate 
Words: unyielding, concerted, firm, combined, united
unyielding

Category: chocolate food 
Words: cupcake, cookies, chocolate cake, fib, fudge

fib