reconnoiter vs stake out

reconnoiter

verb
  • To perform a reconnaissance (of an area; an enemy position); to scout with the aim of acquiring information. 

noun
  • An act or instance of reconnoitering. 

stake out

verb
  • To watch a location and/or people, generally covertly. 

  • To mark off the limits by stakes 

  • To end the game by hitting the stake peg in the middle of the court. 

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