The Lord my Great Lord.
God is the Master and majestic Lord. God is our authority.
Psalms 8 Isaiah 40:3-5 Ezekiel 16:8 Habakkuk 3:19.
Adonai is the plural of Adon. This term is the verbal parallel to Yahweh, Jehovah and YHWH (which was considered too holy to be pronounced). The word "Adonai" is not a proper noun nor is it directly a name of God. It is an emphatic form of the word "Adon" which means "lord" or "master". That is an statement of someone who is above everyone else, the one who is superior, that is why its common use is THE LORD.
Jesus leads the church.
Jesus is the leader and the Lord of the church. True believers will follow his lead because He takes care of them and shows them the right way. Christ is the motor center in which the whole church moves and develops in a wonderful way. How beautiful is to know that from the doctrinal point of view our leader, our sovereign shepherd is in heaven!
Head of the body (Ephesians 4:15-16).
In the beginning was the Word, and the Word was with God, and the Word was God ( John 1:1).