moka pot vs percolator

moka pot

noun
  • A coffeemaker that produces coffee by passing boiling water pressurized by steam through ground coffee, traditionally made of aluminium. 

percolator

noun
  • A device used to brew coffee by passing boiling water through coffee grounds 

  • A pharmaceutical apparatus for producing an extract from a drug by percolation. 

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