surreal vs unreal

surreal

adj
  • Resembling a dream: fantastic and incongruous 

noun
  • surreal number 

unreal

adj
  • very impressive; amazing; unbelievable; incredible; larger or more fantastic than typical of real life. 

  • Not real or substantial; having no actual presence in reality; lacking the characteristics of reality. 

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