engraft vs indoctrinate

engraft

verb
  • To fix firmly into place 

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

adj
  • Engrafted. 

indoctrinate

verb
  • To teach with a biased, one-sided or uncritical ideology; to brainwash. 

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