Archangels supervise all guardian angels and other angels.
Archangels each have their own niche and they always come to you when you call upon them. You can call upon them for immediate assistance. They will be by your side, the second you ask them to be.
In contrast to guardian angels who are by your side every single second of your life, archangels can come and go.
If you wanna learn more, click the tab "Light Beings" to read my descriptions of some of the archangels.