There's no such thing as a "crater volcano." The term "crater" is already an essential part of what defines a volcano.

Here's why:

* Volcanoes: Are geological formations where molten rock (magma) from the Earth's interior erupts onto the surface.

* Crater: Is the bowl-shaped depression at the top of a volcano, formed by the explosive ejection of material during eruptions.

So, every volcano has a crater, but not all craters are created equal. They vary in size and shape depending on the type of eruption and the volcano's structure.

Perhaps you were thinking of a crater lake volcano? This is a volcano that has a crater filled with water, often forming a beautiful lake. Examples include Crater Lake in Oregon, USA, and Lake Taupo in New Zealand.

Let me know if you have any other questions about volcanoes!