engraft vs inseminate

engraft

verb
  • To insert, as a scion of one tree or plant into another, for the purpose of propagation; graft onto a plant 

  • To fix firmly into place 

adj
  • Engrafted. 

inseminate

verb
  • To sow (to disperse or plant seeds). 

  • To impregnate (to cause to become pregnant). 

  • To fill with one's semen. 

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