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: hiking, stingray, shark, fish, tiger

A: hiking
****
Q: close, nearest, touching, on top of, barred

A: barred
****
Q: emotional upsets, fret, truss rod, headstock, jack

A:
emotional upsets
****