Trachodon is a term often used in reference to a group of herbivorous dinosaurs. However, as with many scientific terms, there are several synonyms that can be used to describe these creatures. One of the commonly used synonyms is "hadrosaur," which comes from the Greek words "hadros" meaning "thick" or "bulky" and "sauros" meaning "lizard." Other synonyms include "duck-billed dinosaur" and "ornithopod," which refers to the fact that these dinosaurs walked on two legs and had bird-like hips. These synonyms all describe the same group of herbivorous dinosaurs that lived during the Late Cretaceous period.