Egyptian writers collapsed Nubian and Sudanese into one racial type.

Evidence

But black people fell into a different and much vaguer category. Whether they were Nubian or Sudanese, a single identity was projected onto them: that of al-barbarï, or the Nubian, whose color, customs, and accent Egyptian writers sketched out in numerous essays, dialogues, and stories. — Eve M. Troutt Powell, A Different Shade of Colonialism_…, 311

Categorization

• XREF: Reinforces the reader’s comparative interest: Egypt treated its southern subjects as a homogeneous racial other, mirroring how European colonizers racialized their own subject peoples.