detailing vs specification

detailing

noun
  • Ornamentation on something that has been constructed. 

  • careful cleaning and refurbishing of an automobile, aircraft, boat, etc. 

specification

noun
  • An act of specifying. 

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

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