foot or child
How can the same root mean two totally different things? The answer may tell us something about ancient Greeks' attitude toward children. In Greek, child is paidos. Paidos derived from podos. Apparently, they didn't think very highly of children because the word they chose for them derived from their word for "foot." A child was thought of as someone who was merely "at the foot" of someone else.
Words in which ped or pod means "foot"
pedal, bipedal, podiatrist, pedestrian, tripod, impede, podium, pedestal, peddler, pedicure, macropod, pedigree, pedometer
Words in which ped means "child"
pediatrics, pedagogy, pedophile, pediatrician, Pedialyte, pedagogue, pedagogy, pediatrician