nonillion vs quintillion

nonillion

noun

  • An unspecified very large number. 

num

  • 10³⁰. 

  • 10⁵⁴. 

quintillion

noun

  • Any very large number, exceeding normal description. 

num

  • A billion billion: 1 followed by eighteen zeros, 10¹⁸. 

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