drafting vs draftsmanship

drafting

noun
  • The act or process of producing a technical drawing, or draft. 

  • A method of preparing fibers for weaving. 

  • The practice among ground vehicle drivers or cyclists of following in a close line to reduce wind resistance. 

  • A profession, usually related to making technical drawings for architecture, engineering, or manufacturing. 

draftsmanship

noun
  • the art or craft of a draftsman 

  • the skill of drawing 

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