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: pay, praise, fire, inferno, let go

A: inferno
****
Q: pick, fret, string, fingerpick, sad

A: sad
****
Q: 70, tangle, brisk, fair, cool

A:
cool
****