reenter vs turn back

reenter

verb
  • To enter again; return into. 

  • To enter again; retype, reinput. 

  • To cut deeper where the aqua fortis has not bitten sufficiently. 

turn back

verb
  • To return to a previous state of being. 

  • To cause to reverse direction and retrace one's steps. 

  • To reverse direction and retrace one's steps. 

  • To prevent or refuse to allow passage or progress. 

  • To adjust to a previous setting. 

  • To fold something back; to fold down. 

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