reversal vs verso

reversal

adj
  • Intended to reverse; implying reversal. 

noun
  • A change in fortune; a change from being successful to having problems. 

  • An instance of reversing. 

  • The state of being reversed. 

verso

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

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

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