The term "thunder lizard" is commonly used to describe dinosaurs, specifically the giant herbivores like the Brontosaurus or Diplodocus. However, there are several synonyms for thunder lizard that can add variety to one's vocabulary. Some examples include "gigantic reptile," "prehistoric beast," "colossal dinosaur," "mighty saurian," "enormous dino," and "fierce reptile." Each of these terms highlights the massive size and power of these ancient creatures. Using synonyms can help writers avoid repetitive language while still accurately describing the awe-inspiring creatures that once roamed the earth.