4) Nubian's didn't construct there first Pyramid until the 18th century dynasty of ancient Egypt.. Around 3100 BC did the north and south Egypt unite as one nation while Nubian's known as kushites didn't have a kingdom until 2500 BC. Egypt existed before Nubia.
5) Nubian's had a different language they spoke Nilotic not Afro-Asiatic which is what the ancient egyptians