What title is given that is only given to Yahweh and what title is given that is also given to Yahushua His Son?

Answer From The Annual Reading Schedule - Week 44 Notes For Deuteronomy: Referencing Deuteronomy 10:17 – All throughout Scripture only Yahweh is referred to as "Elohey HaElohiym". This is a title reserved solely for Yahweh all throughout Scripture. This lines up perfectly with what Yahushua said in John 17:3 when He said that Yahweh was "the only true Elohiym". The title of "Elohey HaElohiym" is a title only used exclusively in Scripture for Yahweh and shows His superiority above all – even recognized by His Son Yahushua whom He Himself begot, sent forth, Anointed as King, and made the ruler and judge of the living and the dead.

The other title mentioned, "Adoney HaAdoniym", is a title that both Yahweh and Yahushua are called. Yahushua is called Adoney HaAdoniym in 1 Timothy 6:15, Revelation 17:14, and Revelation 19:16.