erratic vs orderly

erratic

adj
  • Deviating from normal opinions or actions; eccentric; odd. 

  • Unsteady, random; prone to unexpected changes; not consistent. 

noun
  • A rock moved from one location to another, usually by a glacier. 

  • Anything that has erratic characteristics. 

orderly

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

  • Neat and tidy; possessing order. 

  • Methodical or systematic. 

  • Peaceful; well-behaved. 

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

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

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