impact vs intersperse

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. 

intersperse

verb
  • To scatter or insert something into or among other things. 

  • To diversify by placing or inserting other things among something. 

  • To mix two things irregularly, placing things of one kind among things of other. 

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