oneiric vs phantasmal

oneiric

adj
  • Of or pertaining to dreams. 

  • Resembling a dream; dreamlike. 

phantasmal

adj
  • Expresses qualities of or produced from fantasy. 

  • Of or pertaining to ghosts or phantoms. 

  • Eerie or frightening. 

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