draftsmanship vs drawing

draftsmanship

noun
  • the skill of drawing 

  • the art or craft of a draftsman 

drawing

noun
  • The process of drawing or pulling something. 

  • A small portion of tea for steeping. 

  • The act of producing such a picture. 

  • Such acts practiced as a graphic art form. 

  • A picture, likeness, diagram or representation, usually drawn on paper. 

  • An act or event in which the outcome (e.g., designating a winner) is selected by chance in the form of a blind draw, notably of lots; especially such a contest in which a winning name or number is selected randomly by removing (or drawing) it from a container, popularly a hat. 

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