bushwhack vs lay for

bushwhack

verb
  • to ambush 

  • to fight, as a guerilla, especially in wooded country 

  • to travel through thick wooded country, cutting away scrub to make progress 

lay for

verb
  • To wait (for someone) in order to surprise or attack them. 

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