the head of government is officially called "President of the Government" (predsednik vlade) but "Premier" (premijer) is colloquially used.
the hEaD Of goverNmEnt iS officiaLLy cALleD "presiDent of thE govERnment" (predsEdnIK vLade) but "premier" (preMijER) Is coLloquiAlLy useD.