monogram vs xylograph

monogram

verb
  • To mark something with a monogram. 

noun
  • A design or motif composed of one or more letters, often intertwined, used as an identifying mark of an individual or institution. 

xylograph

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

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.). 

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