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: glass, wood, coating, knifer, woodwork

A: knifer
****
Q: lower, backward, down, falling, shameful

A: shameful
****
Q: level, prime, probation, fine, money

A:
level
****