monoprint vs tracing

monoprint

noun
  • A form of printing on paper from a glass sheet to which oil paint has been applied; monotype. 

verb
  • To print using this technique. 

tracing

noun
  • The reproduction of an image made by copying it through translucent paper. 

  • A record in the form of a graph made by a device such as a seismograph. 

  • The process of finding something that is lost by studying evidence. 

  • A regular path or track; a course. 

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