cajoler vs kowtower

cajoler

noun
  • A person who cajoles; a flatterer. 

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

kowtower

noun
  • One who kowtows; a sycophant. 

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