discuss vs talk over

discuss

verb
  • To converse or debate concerning a particular topic. 

  • To examine or search thoroughly; to exhaust a remedy against, as against a principal debtor before proceeding against the surety. 

talk over

verb
  • To discuss; to converse about a matter or issue. 

  • To persuade (someone); to talk around. 

  • To verbally interrupt (someone); to speak at the same time as someone else. 

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