Archangels are seraphs according to mythology, but not all seraphs are archangels.
The English term archangel is based on a Greek term archangelos, which means chief or first angel. That would put the archangel over Seraphim or any other class of angels.
St. Michael was created an Archangel and Seraphim when God decided to share the glory of his beatific vision when he created the angelic orders as pure spirit to know, love, and serve him, and sing his perpetual hymns of praise in Heaven.
Host. A host of angels / cherubim. The word "host" can apply for any level or rank of angel, be it angel, archangel, seraphim or cherubim.
Seraphim is the plural and the seraph is the singular
Gonerilia seraphim was created in 1886.
Seraphim Digital was created in 2006.
Seraphim - band - was created in 2001.
Seraphim Call was created in 1999.
As strange as it may sound, the Bible is fairly silent on 'hierarchy' of angels though it mentions 'Seraphim' surrounding God's Throne and Michael, the chief prince of the sons of Man, also the only one called an 'archangel.' This is primarily a man-made concept so see link below:
No. Seraphim are in Heaven attending the throne of God.
The duration of Seraphim Falls is 1.92 hours.
The seraphim hovered above the throne, their wings shimmering with radiant light.
Not sure I assume God thinks to himself at a particular point and time and decides to create an Archangel, a Cherubim and/or a Seraphim, and maybe an ordinary Angel of lower status