nonillion vs umptillion

nonillion

noun

  • An unspecified very large number. 

num

  • 10³⁰. 

  • 10⁵⁴. 

umptillion

noun

  • An extremely large, unspecified number (of). 

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