scaffy vs vacuum cleaner

scaffy

noun
  • A street sweeper; a dustman, a refuse collector. 

vacuum cleaner

noun
  • A domestic or industrial mobile machine for cleaning floors and similar surfaces that draws dust and other particles into a container (a cyclonic type bin, or a filter bag) by the suction created by an electric motor driving a fan. 

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