turnabout vs verso

turnabout

noun
  • The act of turning about so as to face in the opposite direction 

  • A reversal of a decision or opinion etc; a change of mind or flip-flop 

  • A merry-go-round. 

verso

noun
  • The back side of a flat object which is to be examined visually, as for reading, such as a sheet, leaf, coin or medal; 

  • The left-hand page of a book of a script which reads from left to right, usually having an even page number. 

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