What was the primordial water of chaos in Egyptian mythology?

The story behind the answer

Nun is correct because it names the limitless, formless waters that existed before creation in Egyptian myth. From Nun, the first mound (benben) arose and the creator (often Atum or Ra) emerged to shape the ordered world. By contrast, Ra is the sun god, Amun is the “hidden” creator deity, and Osiris rules the afterlife—none of them are the chaotic waters themselves.

Context: In the Hermopolitan tradition, Nun (with his female counterpart Naunet) belongs to the Ogdoad—eight deities embodying primeval conditions like darkness, hiddenness, infinity, and water. Memory tip: “Nun = none-formed” — the not-yet-shaped waters before anything existed.