commanding vs specification

commanding

noun
  • The act of giving a command. 

adj
  • Tending to give commands, authoritarian. 

  • Impressively dominant. 

  • Dominating from above, giving a wide view 

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 commanding and specification occurred in a corpus of books? (source: Google Ngram Viewer )