food processor vs thresher

food processor

noun
  • A small kitchen appliance for chopping or pureeing food. 

thresher

noun
  • A modern farm machine for threshing grain, now a part of combine harvesters rather than a separate implement. 

  • Anything or anyone that threshes. 

  • A now-obsolete hand tool for threshing, also called a flail. 

  • Any of several large pelagic sharks of the genus Alopias, which have a very long tail; more commonly called thresher sharks. 

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