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 medicine, DM medicine,McH surgical process as in superspecialists--who have education more than a MD/MS. they need small specialised in a very organ system intrinsically thus ar additional consultants for diseases system wise as in gastroenterology(stomach and intestine) system, systema nervosum as in DM neurology, diseases of polygenic disorder etc as in DM medicine.