biped
a creature with two feet
centipede
a creature with 100 feet
impediment
a barrier; obstruction
millipede
a creature with 1,000 feet
pedal
a lever that is moved with one's foot
Peddler
a person who goes from door to door on foot trying to sell a product
pedestrian
a person who walks across the street on foot
pedicure
a foot treatment that could include soaking the feet and polishing the toenails
quadruped
a four-footed creature
tripod
a three-footed stand often used to balance a camera
ped
foot