The term "Nawaab" is often used to refer to any Muslim ruler in north or south India while the term "nizam" is preferred for a senior official—it literally means "governor of region". The Nizam of Hyderabad had several nawabs under him: Nawabs of Cuddapah, Sira, Rajahmundry, Kurnool, Chicacole, et al. "Nizam" was his personal title, awarded by the Mughal Government and based on the term "Nazim" as meaning "senior officer". "Nazim" is still used for a district collector in many parts of India. The term "nawab" is still technically imprecise, as the title was also awarded to Hindus and Sikhs, as well, and large zamindars and not necessarily to all Muslim rulers. With the decline of that empire, the title, and the powers that went with it, became hereditary in the ruling families in the various provinces.