engraft vs infiltrate

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. 

infiltrate

verb
  • To pass through something by filtration. 

  • To cause to penetrate in this way. 

  • To invade or penetrate a tissue or organ. 

  • To surreptitiously penetrate, enter or gain access to. 

  • To send (soldiers, spies, etc.) through gaps in the enemy line. 

  • To move from a vein, remaining in the body. 

  • To cause (a liquid) to pass through something by filtration. 

noun
  • Any undesirable substance or group of cells that has made its way into part of the body. 

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