backscratcher vs sweet talker

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. 

sweet talker

noun
  • Someone who uses insincere flattery; a flatterer. 

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