contra vs verso

contra

noun
  • A deal to swap goods or services. 

  • A conservative; originally tied to Nicaraguan counter-revolutionaries. 

  • An entry (or account) that cancels another entry (or account). 

  • Any of the musical instruments in the contrabass range, e.g. contrabassoon, contrabass clarinet or, especially, double bass. 

  • A contra dance. 

adv
  • contrary to something 

prep
  • against; contrary or opposed to; in opposition or contrast to 

verb
  • To undo; to reverse. 

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 contra and verso occurred in a corpus of books? (source: Google Ngram Viewer )