street sweeper vs vacuum cleaner

street sweeper

noun
  • A machine used to sweep streets. 

  • A person who is employed to sweep streets, pavements, and gutters, keeping them clear of litter. 

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 street sweeper and vacuum cleaner occurred in a corpus of books? (source: Google Ngram Viewer )