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: dally, misuse, fritter, whittle, patty

A: patty
****
Q: backward, south, down, forward, shameful

A: shameful
****
Q: ground, fire, ban, combustion, water

A:
ban
****