backscratcher vs cajoler

backscratcher

noun
  • A long slender rod with a rake-like device on one end, sometimes in the form of a human hand, designed to let a person scratch their own back. 

cajoler

noun
  • A person who cajoles; a flatterer. 

  • A speech act intended to persuade or convince, such as the utterance "you know". 

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