corroboration vs manifestation

corroboration

noun
  • That which corroborates. 

  • The act of corroborating, strengthening, or confirming; addition of strength; confirmation 

manifestation

noun
  • The embodiment of an intangible, or variable thing. 

  • A pattern or logo on a sheet of glass, as decoration and/or to prevent people from accidentally walking into it. 

  • The act or process of becoming manifest. 

  • The symptoms or observable conditions which are seen as a result of some disease. 

  • This particular manifestation resembled a young girl crying. 

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