impregnate vs inseminate

impregnate

verb
  • To cause to become pregnant. 

  • To saturate, or infuse. 

  • To fill pores or spaces with a substance. 

  • To fertilize. 

inseminate

verb
  • To impregnate (to cause to become pregnant). 

  • To sow (to disperse or plant seeds). 

  • To fill with one's semen. 

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