Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Q: fire, instruct, inferno, retire, scold

A: inferno
****
Q: crew, board, deck, rudder, hull

A: board
****
Q: rich, fudge, cupcake, smear, cookies

A:
smear
****