expository vs indicative

expository

adj
  • Serving to explain, explicate, or elucidate; expositive; of or relating to exposition. 

indicative

adj
  • serving as a sign, indication or suggestion of something 

  • of, or relating to the indicative mood 

noun
  • The indicative mood. 

  • A term in the indicative mood. 

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