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: luke, make the grade, fair, milky, deal

A: milky
****
Q: lollygag, cake, misuse, goodbye, fritter

A: cake
****
Q: knifer, knive, metal, glass, plate

A:
metal
****