Ped
Biped
A creature with two feet
Peddler
A person who goes from door to door on foot trying to sell a product
A creature with 100 feet
centipede
Pedestrian
A person who walks across the street on foot
Impediment
Something that stands in ones way
A foot treatment that could include soaking the feet and polishing toenails
Pedicure
Millipede
A creature with 1,000 feet
Quadrupled
A foot footed creature
Pedal
A lever that is moved with ones foot
Tripod
A three footed stand often used to balance a camra