Here are some examples of words with the root "terr":
* Terrestrial: Relating to the earth or its inhabitants.
* Terrain: The physical features of a particular area of land.
* Terrace: A raised, flat area of land.
* Terrorist: A person who uses violence and intimidation in the pursuit of political aims.
* Territory: An area of land under the control of a particular state or government.
The meaning of "terr" can be slightly modified in different words, but it always relates to the concept of the earth or land in some way.