What's the difference between "capital" and "capitol"?

The word “capital” comes from the Latin word “capitalis,” meaning “of the head.” It is used to describe the city that is the administrative, cultural, and economic center of a country or state. Examples include Washington, D.C. (the capital of the United States), London (the capital of the United Kingdom), and Tokyo (the capital of Japan). In contrast, the word “capitol” refers specifically to the building where a government’s legislative body, such as a parliament or congress, convenes. The most famous example is the United States Capitol building in Washington, D.C., which houses the U.S. Congress.