nonhuman vs subhuman

nonhuman

noun
  • A creature or thing that is not human. 

adj
  • Not human; not of the human race. 

subhuman

noun
  • Anything which is less than human. 

adj
  • Less than human; lacking characteristics of a human. 

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