specification vs stencil

specification

noun
  • An act of specifying. 

  • An explicit set of requirements to be satisfied by a material, product, or service. 

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. 

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