The original meaning (and spelling) of daemon was inferior god (lesser deity). Kind of like titan meaning Stretchers or Strainers. Daemones are also called personified spirits.
Examples:
- Agathodaemon is called a daemon.
- Cacodaemon is called a daemon.
- Sophrosyne is called a goddess.
- Mnemosyne is called a goddess.
- Phobos and Demos are called both.
- Pseudologos is called a deamon.
- Nike is called a goddess.
What are some called one but not the other?