The Hawaiian capital is Honolulu, which is an 8-letter word. Honolulu is the most populous city in Hawaii and is located on the island of Oahu. It is the cultural, commercial, and governmental center of the state. Honolulu is home to a number of historic sites, including the Iolani Palace, the only royal palace in the United States. The city is also known for its beautiful beaches and vibrant nightlife.