impact vs penetrate

impact

verb
  • To significantly or strongly influence or affect; to have an impact on. 

  • To stamp or impress onto something. 

  • To collide or strike, the act of impinging. 

  • To compress; to compact; to press into something or pack together. 

noun
  • A significant or strong influence or effect. 

  • A forced impinging. 

  • The striking of one body against another; collision. 

  • The force or energy of a collision of two objects. 

penetrate

verb
  • To affect profoundly through the senses or feelings; to move deeply. 

  • To enter into; to make way into the interior of; to pierce. 

  • To achieve understanding of, despite some obstacle; to comprehend; to understand. 

  • To move a piece past the defending pieces of one's opponent. 

  • To insert the penis into an opening, such as a vagina, mouth or anus. 

  • To infiltrate an enemy to gather intelligence. 

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