inhuman vs nonhuman

inhuman

adj
  • Transcending or different than what is human. 

  • Of or pertaining to inhumanity and the indifferently cruel, sadistic or barbaric behavior it brings. 

nonhuman

adj
  • Not human; not of the human race. 

noun
  • A creature or thing that is not human. 

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