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: fly, grasshopper, walk, waggle, train

A: train
****
Q: fly, swim, car, beetle, grasshopper

A: car
****
Q: fine, neat, hearing, firstrate, custody

A:
neat
****