percolate vs suffusion

percolate

noun
  • A liquid that has been percolated. 

verb
  • To pass a liquid through a porous substance; to filter. 

  • To make (coffee) in a percolator. 

  • To drain or seep through a porous substance. 

  • To spread slowly or gradually; to slowly become noticed or realised. 

suffusion

noun
  • The act of pouring a liquid over or soaking something. 

  • coat, coating, film, plating. 

  • The state of becoming red on the surface. 

  • The state of being wet. 

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