impact vs preen

impact

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

  • To stamp or impress onto something. 

  • To collide or strike, the act of impinging. 

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

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. 

preen

verb
  • To comb; to make orderly. 

  • To spend time making oneself attractive and admiring one's appearance, e.g. in front of a mirror. 

  • To trim up, as trees. 

  • To improve the appearance of; groom; prettify. 

  • To flatter. 

  • To groom; to trim or dress with the beak, as the feathers. 

  • To show off, posture, or smarm. 

  • To pin; fasten. 

noun
  • bodkin; brooch 

  • A forked tool used by clothiers for dressing cloth. 

  • pin 

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