diversion vs impetus

diversion

noun
  • A hobby; an activity that distracts the mind. 

  • A detour, such as during road construction. 

  • Officially halting or suspending a formal criminal or juvenile justice proceeding and referral of the accused person to a treatment or care program. 

  • The act of diverting. 

  • Removal of water via a canal. 

  • The rerouting of cargo or passengers to a new transshipment point or destination, or to a different mode of transportation before arrival at the ultimate destination. 

  • A tactic used to draw attention away from the real threat or action. 

impetus

noun
  • An activity in response to a stimulus. 

  • The force or energy associated with a moving body; a stimulus. 

  • Anything that impels; a stimulating factor. 

  • A force, either internal or external, that impels; an impulse. 

  • A principle of motive force, held as exquivalent to weight times velocity by John Buridan, in an auxiliary theory of Aristotelian dynamics introduced by John Philoponus, describing projectile motion against gravity as linear until it transitions to a vertical drop and the intellectual precursor to the concepts of inertia, momentum and acceleration in classical mechanics. 

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