The Austrian capital is VIENNA, which is a 6-letter word. VIENNA is the largest city in Austria and is the country's cultural, economic, and political center. It is also one of the oldest cities in Europe, having been founded in the 12th century. VIENNA is known for its rich history, beautiful architecture, and vibrant culture. It is home to many famous landmarks, including the VIENNA State Opera, Schönbrunn Palace, and St. Stephen's Cathedral.