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: acceptable, mad, fine, comfortable, probation

A: probation
****
Q: fish, stingray, climbing, trap, hiking

A: stingray
****
Q: punch, pack, deck, check, fold

A:
punch
****