Spiritual beings: Elementals or Ethereals
Besides the physical world there is the spiritual world. These two are often imagined as being separated, but in reality is the spiritual world everywhere around you. Everything which exist is begin kept in form by a spiritual being. The being who keep the physical world in exist are called originally elementals.
From fairytales and myths we now the bigger, classical beings, as elves/fairies, dwarfs, nymphs and gnomes. These beings are originally active in nature and keeping nature in existence. Besides these are innumerable beings who take care of human made objects.
While these last aren’t working in a separate element, I call them ethereals. Ether is the name for the shape giving energy between the physical and astral/soul world. Ethereals work from the etherworld into the physical world. From the ether they call everything into existence.