mezzotint vs woodblock

mezzotint

noun
  • An etching or print made using this method. 

  • A form of intaglio etching in which a metal plate is roughened evenly and then smoothed to bring out an image. 

verb
  • To make such etchings 

woodblock

noun
  • A wooden block used as a printing form. 

  • The emergency issue of the Cape triangles, printed in 1861. 

  • A woodcut. 

  • A percussion instrument consisting of a hollow block of wood struck with a drumstick. 

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