Which word has the same root as terrain?

Here's why:

* Terrain comes from the Latin word "terra" which means "earth" or "land."

* The word "terra" is the root of many English words related to the earth, like "terrestrial" (relating to the earth), "territory" (an area of land), and "terrace" (a level area of land).

So, "terra" is the common root that connects all these words.