infiltration vs soakage

infiltration

noun
  • The act or process of infiltrating, as of water into a porous substance, or of a fluid into the cells of an organ or part of the body. 

  • The substance which has entered the pores or cavities of a body. 

  • The act of secretly entering a physical location and/or organization. 

  • process by which water on the ground surface enters the soil. 

soakage

noun
  • The act of soaking. 

  • A source of water in Australian deserts, where water has seeped into the sand. 

  • food or nonalcoholic beverages consumed before or during a bout of drinking to slow down the onset of drunkenness 

  • The amount of liquid soaked in. 

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