exertive vs in force

exertive

adj
  • Having power or a tendency to exert; using exertion. 

in force

prep
  • With a substantial display of resources. 

  • In effect; applicable. 

  • With a substantial number of men capable of exerting force or of making a show of force. 

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