explore vs go over

explore

verb
  • To examine or investigate something systematically. 

  • To travel somewhere in search of discovery. 

  • To be engaged exploring in any of the above senses. 

  • To examine diagnostically. 

  • To (seek) experience first hand. 

  • To seek sexual variety, to sow one's wild oats. 

  • To wander without any particular aim or purpose. 

noun
  • An exploration; a tour of a place to see what it is like. 

go over

verb
  • To look at carefully; to scrutinize; to analyze. 

  • To create a response or impression. 

  • Used other than figuratively or idiomatically: see go, over. 

  • To score a try. 

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