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