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: bats, pounce, cockroach, bike, fly

A: bike
****
Q: air, fire, hire, ban, promote

A: air
****
Q: doughnut, apple, fritter, waste away, dumpling

A:
waste away
****