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: finger, heel, foot, ounce, elbow

A: ounce
****
Q: fret, worried, chord, notes, headstock

A: worried
****
Q: bowl, glass, coating, knife, knifer

A:
coating
****