Lucifer - The archangel who got vein and was punished for his hubris.
Satan - An angel of the rank just below archangel. He was Lucifer's second in command before the fall. He's a truly evil being.
Mephistopheles - An angel of the same rank as Satan and Lucifer's third in command before the fall. Also a truly evil being.
The Devil - A title for the king of the demons.
Demons - Any being that goes so bad that they are recruited/thrown into hell without dying.
Purgatory - The place within hell where evil beings who die go. Also the location of Lucifer's cage.
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The Framing of Lucifer
HorrorLet's just say that Satin, Mephistopheles, and the devil are not synonyms for Lucifer. If you're religious and techy about blasphemy you should not read this.