imposture vs subterfuge

imposture

noun
  • The act or conduct of an impostor; deception practiced under a false or assumed character; fraud or imposition 

subterfuge

noun
  • Deception; misrepresentation of the true nature of an activity. 

  • An indirect or deceptive device or stratagem; a blind. Refers especially to war and diplomatics. 

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