The Capitol, the iconic building in Washington D.C. where the U.S. Congress meets, has a range of synonyms that you might find useful in your writing or speech. For one, it could be simply referred to as "Congress." Other synonyms might include "the legislative branch of government," "the Federal government's center," or "the heart of Washington." Another term you could use is "the Capitol Building," or "the U.S. Capitol." Each of these terms evokes a slightly different meaning or connotation, but they all refer to the same place. No matter which synonym you choose, the Capitol remains a powerful symbol of our nation's political power and history.