infiltrate vs seep

infiltrate

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

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

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

seep

verb
  • (of a crack etc.) To allow a liquid to pass through, to leak. 

  • To enter or penetrate slowly; to spread or diffuse. 

  • To diminish or wane away slowly. 

  • To ooze or pass slowly through pores or other small openings, and in overly small quantities; said of liquids, etc. 

noun
  • The seeping away of a liquid, etc. 

  • A seafloor vent. 

  • Moisture, liquid, gas, etc. that seeps out; a seepage. 

  • A small spring, pool, or other spot where liquid from the ground (e.g. water, petroleum or tar) has oozed to the surface; a place of seeping. 

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