polaroid vs xylograph

polaroid

noun
  • A print from such a camera. 

  • Polaroid sunglasses. 

  • A sheet of plastic embedded with microscopic crystals of herapathite or similarly acting material, so that light passing through it is polarised. 

  • A camera that develops its own film. 

verb
  • To photograph with a polaroid camera. 

xylograph

noun
  • A print taken from such an engraving. 

  • An engraving in wood or woodcut, especially one used in printing predating the Western tradition (14th c.). 

verb
  • To make a print from an engraving in wood. 

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