desolation vs pessimism

desolation

noun
  • The state of being desolated or laid waste 

  • The act of desolating or laying waste; destruction of inhabitants; depopulation. 

  • A place or country wasted and forsaken. 

pessimism

noun
  • The condition of being pessimal. 

  • A general belief that bad things will happen. 

  • The doctrine that this world is the worst of all possible worlds. 

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