is a specific kind of: pedal extremity, vertebrate foot.

is a broader term that covers: flatfoot, pes planus, splayfoot.

has as a part: calcaneus, heelbone, os tarsi fibulare | arcuate artery, arteria arcuata | arteria digitalis, digital arteries | arteria metatarsea, metatarsal artery | intercapitular vein, vena intercapitalis | metatarsal vein, vena metatarsus | instep | sole | toe | big toe, great toe, hallux | little toe | heel ... show more.

is a part of: homo, human, human being, man | leg.

derivation: foot, hoof, hoof it, leg it.