Titles, nicknames, and honorifics
Muggles

Prime Minister

To his great surprise, the Prime Minister felt a fleeting stab of pity for Fudge at this point. It was, however, eclipsed almost immediately by a glow of smugness at the thought that, deficient though he himself might be in the area of materializing out of fireplaces, there had never been a murder in any of the government departments under his charge... (HBP1)

The head of the executive branch of government of Great Britain and Northern Ireland (NSOED). The Prime Minister’s official residence is number ten, Downing Street in London.

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Tags: muggle government

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Titles, nicknames, and honorifics
Acting Head Assistant Head Bread Head Chancellor of the Exchequer Dark Lord Fifth Years First Years Fourth Years Head Boy Head Girl Head of the Body for Protection of Magical Species (Humanoid) Heir of Slytherin Hermy Hogsmeaders Hogwartians Hogwarts High Inquisitor
Hogwarts Staff titles Keeper of the Keys Keeper of Treasure and Dragots MACUSA President Magbob Malfoy the Unanxious Master Master of Death Matron Moony, Wormtail, Padfoot, and Prongs Mouldy Voldy No-Maj Potioneer Potions Master Prefects Prime Minister
Ronnie Saint Potter, the Mudblood’s Friend Scorpius the Dreadless Sub-division dealing with No-Maj Fraternisation Supreme Mugwump The Augurey The Boy Who Lived The Chosen One The Half-Blood Prince The Marauders The Potterer The Scorpion King The Slytherin Squib Undesirable Number One Won-Won
Sources
Half-Blood Prince Chapter 1