A multispeciality --hospital--may have post graduate disciplined doctors as MD drugs, MD medicine, MS surgery
A superspeciality hospitals could have doctors with degrees as in DM neurology, McH urogenital medicine, DM medicine,McH surgical procedure as in superspecialists--who have education more than a MD/MS. they need small specialised during a organ system per se thus ar a lot of specialists for diseases system wise as in gastroenterology(stomach and intestine) system, system as in DM neurology, diseases of polygenic disease etc as in DM medical specialty.