aide-de-camp vs orderly

aide-de-camp

noun
  • A military officer who serves as an adjutant to a higher-ranking officer, prince or other high political dignitary. 

orderly

noun
  • A soldier who carries out minor tasks for a superior officer. 

  • A hospital attendant given a variety of non-medical duties. 

adj
  • Being on duty; keeping order; conveying orders. 

  • Neat and tidy; possessing order. 

  • Methodical or systematic. 

  • Peaceful; well-behaved. 

How often have the words aide-de-camp and orderly occurred in a corpus of books? (source: Google Ngram Viewer )