superterrestrial vs tellurian

superterrestrial

adj
  • Above the Earth or earthly concerns. 

tellurian

adj
  • Of or relating to the earth; (specifically, chiefly science fiction) inhabiting planet Earth as opposed to other planets. 

  • Of a mineral: containing tellurium. 

How often have the words superterrestrial and tellurian occurred in a corpus of books? (source: Google Ngram Viewer )