cajoler vs soft-soap

cajoler

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

  • A person who cajoles; a flatterer. 

soft-soap

noun
  • Persuasion by means of flattery or pleasing words. 

verb
  • To attempt to persuade by flattery or pleasing words; to butter up. 

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