monoprint vs underline

monoprint

verb
  • To print using this technique. 

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

underline

verb
  • To draw a line underneath something, especially to add emphasis; to underscore 

  • To emphasise or stress something 

noun
  • A line placed underneath a piece of text in order to provide emphasis or to indicate that it should be viewed in italics or (in electronic documents) that it acts as a hyperlink. 

  • The character _. 

adj
  • Passing under a railway line. 

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