pedagogue vs rav

pedagogue

noun
  • A teacher or instructor of children; one whose occupation is to teach the young. 

  • A pedant; one who by teaching has become overly formal or pedantic in his or her ways; one who has the manner of a teacher. 

  • A slave who led the master's children to school, and had the charge of them generally. 

verb
  • To teach. 

rav

noun
  • a teacher or spiritual guide 

  • a rabbi 

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