There are several synonyms for the word "elephant skin." One of the most common is "pachyderm skin," which derives from the Greek "pachydermos," meaning "thick-skinned." Another synonym is "rhinoceros hide," which refers to the natural armor-like texture of rhinoceros skin. Additionally, "hippopotamus hide" is another synonym, as hippos also have very thick and tough skin. Some other less often used synonyms include "mammoth skin," "behemoth hide," and "giant sloth pelt." Ultimately, these synonyms all describe a tough, thick, and protective outer layer that belongs to some of the largest and strongest animals in the animal kingdom.