flipside vs verso

flipside

noun
  • The B-side of a phonograph record. 

  • A necessary consequence or corollary of something that acts as a negation or counterbalance; especially one seen as opposite, or as pro versus con. 

  • The reverse, in contrast to the obverse. 

  • The occasion when we meet again (e.g. when I return from work, etc.; said on parting); later or tomorrow. 

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