centipede vs. millipede

centipede

[sen-tuh-peed] / ˈsɛn təˌpid /

noun

any of numerous predaceous, chiefly nocturnal arthropods constituting the class Chilopoda, having an elongated, flattened body composed of from 15 to 173 segments, each with a pair of legs, the first pair being modified into poison fangs.

millipede

[mil-uh-peed] / ˈmɪl əˌpid /

Or millepede

any terrestrial arthropod of the class Diplopoda, having a cylindrical body composed of 20 to more than 100 segments, each with two pairs of legs.