trillion vs zillion

trillion

noun
  • A statistic formed by a player playing some number of minutes, but recording no stats. 

num
  • A million million: 1 followed by twelve zeros, 10¹². 

zillion

noun
  • An unspecified large number (of); a gazillion. 

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