The term 'MAJOR OIL HUB' can be summarized as Tulsa, a city in Oklahoma with five letters. Tulsa is known for its oil industry and is considered one of the major hubs for oil production in the United States. It is home to many oil companies and has been an important part of the American oil industry since the early 1900s. The city is also known for its vibrant culture and art scene, making it a popular destination for tourists.