egression vs playthrough

egression

noun
  • The act of going; egress. 

playthrough

noun
  • The act, or a recording, of playing a game from start to finish. 

  • The cumulative monetary amount that must be wagered before an account may be withdrawn, typically stated as a multiple of the initial deposit. 

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