Stegoceras is a genus of small, dome-headed, bipedal herbivorous dinosaur. The name Stegoceras is derived from the Greek words stego, which means "roof," and keras, which means "horn." While Stegoceras is the most commonly used name for this dinosaur, it has several synonyms. These synonyms include Troodon validus, Sphaerotholus goodwini, and Pachycephalosaurus wyomingensis. These synonyms are based on classification changes and morphological differences that were discovered over time. However, it is important to note that some paleontologists still consider all of these names to be valid and refer to this dinosaur with the name Stegoceras.