Muggle

While claiming to be the dark witch Bellatrix Lestrange, Yasmin Khan called a dungeon keeper a "foolish Muggle". (COMIC: Herald of Madness)

Behind the scenes
The term "Muggle" in the world of Harry Potter refers to non-magical folk, who are kept unaware of the affairs of witches and wizards. Just as Yaz uses the term here, many wizards in Rowling's wizarding world, viewing themselves as inherently superior, use this term disparagingly.