nonoperational vs operational

nonoperational

adj
  • Not operating; not working. 

  • Not associated with operation. 

operational

adj
  • Effective or operative. 

  • Determined by means of practical measures. 

  • Of or relating to operations, especially military operations. 

  • Functioning and ready for use. 

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