What is another word for tectonic plates?

There isn't a single perfect synonym for "tectonic plates," as it's a specific geological term. However, depending on the context, you could use:

* Lithospheric plates: This is a more technical term referring to the rigid outer layer of the Earth.

* Continental plates: This emphasizes the movement of landmasses.

* Earth's plates: This is a general term that highlights the Earth's structure.

* Plates: This is a shortened, informal term that can be used if the context is clear.

Ultimately, the best alternative depends on the specific situation.