wood engraving vs xylograph

wood engraving

noun
  • A print taken from such an engraving. 

  • A variation of the woodcut method executed with a different tool (burin) and different wood (end grain), allowing for more detailed images. 

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 wood engraving and xylograph occurred in a corpus of books? (source: Google Ngram Viewer )