filtering vs soakage

filtering

noun
  • Something that passes through a filter. 

  • The process of passing something through a filter. 

soakage

noun
  • The amount of liquid soaked in. 

  • 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 

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