ped
what is a biped
a creature with two feet
peddler
a person who goes from door to door on foot trying to sell a product
centipede
a creature with 100 feet
pedestrian
a person who walks across the street on foot
impediment
something that stands in ones way
pedicure
a foot treatment that could include soaking the feet and polishing the toenails
millipede
a creature with 1000 feet
quadruped
a four footed creature
pedal
a lever that is moved with ones foot
tripod
a three footed stint often used to balance a camera