rav vs tuition

rav

noun
  • a teacher or spiritual guide 

  • a rabbi 

tuition

noun
  • The training or instruction provided by a teacher or tutor. 

  • A sum of money paid for instruction (such as in a high school, boarding school, university, or college). 

  • Paid private classes taken outside of formal education; tutoring. (also used attributively) 

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