Αἰγύπτιος

Acts 7:22 Αἰγυπτίων· of [the] Egyptians;

So Moses was educated in all the wisdom of the Egyptians and was powerful in speech and action.

Here: 'Of the Egyptians.' To Greek-speaking hearers Egypt was the most ancient and respected seat of learning in the world.

Acts 7:24 Αἰγύπτιον. Egyptian.

And when he saw one of them being mistreated, Moses went to his defense and avenged him by striking down the Egyptian who was oppressing him.

Acts 7:28 Αἰγύπτιον; Egyptian?’

Do you want to kill me as you killed the Egyptian yesterday?’

Acts 21:38 Αἰγύπτιος Egyptian

“Aren’t you the Egyptian who incited a rebellion some time ago and led four thousand members of the Assassins into the wilderness?”

Hebrews 11:29 Αἰγύπτιοι Egyptians

By faith the people passed through the Red Sea as on dry land; but when the Egyptians tried to follow, they were drowned.

Here: The pursuing chariot army of Exodus 14. They are set against the unnamed 'they' of faith. Both groups took the same road and met opposite ends.