EDGE vs footstep

EDGE

noun
  • Explain, demonstrate, guide, enable; an educating method. 

  • Notation for an edge rusher. 

footstep

noun
  • The indications or waypoints of a course or direction taken. 

  • A step, as in a stair. 

  • The sound made by walking, running etc. 

  • The mark or impression left by a foot; a track. 

  • The act of taking a step. 

  • The distance between one foot and the next when walking; a pace. 

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