chiseler vs smooth operator

chiseler

noun
  • A cheat; a swindler; a con artist. 

  • A child. 

  • One who uses a chisel for carving. 

smooth operator

noun
  • A skillful, manipulative person, con artist, or clever scoundrel. 

  • A person who accomplishes tasks with efficiency and grace, especially one with verbal skills who is persuasive in interpersonal relationships, negotiation, etc. 

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