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: invent, smuggled, smear, fudge, pie

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

A: air
****
Q: tide, belated, signal, current, jetstream

A:
belated
****