Archangel. Derived from “ar-kho” meaning to reign or rule over and “angelos” meaning angel. (Ruler over the angels.)
The president of the US is commander in chief of the military even though he may not be a soldier. He is the ruler over the angels.
Likewise Christ is Michael the archangel though not an angel.
1 Thessalonians 4:16 KJV
For the LORD himself shall descend from heaven with a shout, with the voice of the ARCHANGEL, and with the trump of GOD: and the dead in Christ shall rise first:
As God, He is the supreme commander of the angels. Archangel means ruler over the angels.