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: level, smooth, flat, lined, elevation

A: level
****
Q: foot, knee, eye, leg, ounce

A: ounce
****
Q: social, pester, fawn, buck, paw

A:
buck
****