suffusion vs topcoat

suffusion

noun
  • coat, coating, film, plating. 

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

  • The state of becoming red on the surface. 

  • The state of being wet. 

topcoat

noun
  • A layer of paint or varnish etc. applied after the undercoat. 

  • A light overcoat. 

verb
  • To apply a topcoat to. 

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