The Thai capital is BANGKOK, which is a 7-letter word. BANGKOK is the most populous city in Thailand and is the country's economic, political, social, and cultural center. It is located on the east bank of the Chao Phraya River and is home to more than 8 million people. BANGKOK is known for its vibrant nightlife, bustling markets, and ornate temples. It is also a major tourist destination, with millions of visitors each year.