stencil vs tessellation

stencil

noun
  • A pattern produced using such a utensil. 

  • A two-ply master sheet for use with a mimeograph. 

  • A thin sheet, either perforated or using some other technique, with which a pattern may be produced upon a surface; a utensil that contains a perforated sheet. 

verb
  • To print with a stencil. 

tessellation

noun
  • A tiling pattern with no gaps; the result of tessellating an area or plane. 

  • The property or fact of tessellating. 

  • polygon tessellation. 

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