mentor vs teacher

mentor

noun
  • A wise and trusted counselor or teacher. 

verb
  • To act as someone's mentor. 

teacher

noun
  • A person who teaches, especially one employed in a school. 

  • The index finger; the forefinger. 

  • An indication; a lesson. 

  • The second highest office in the Aaronic priesthood, held by priesthood holders of at least the age of 14. 

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