percolate vs simmer

percolate

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

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

  • To make (coffee) in a percolator. 

  • To drain or seep through a porous substance. 

noun
  • A liquid that has been percolated. 

simmer

verb
  • To develop gradually, of an idea or plan. 

  • To cook or undergo heating slowly at or below the boiling point. 

  • To be on the point of breaking out into anger; to be agitated. 

  • To cause to cook or to cause to undergo heating slowly at or below the boiling point. 

  • To remain angry with someone or something past the point of exhaustion; to resign oneself to holding a grudge, especially after some failed attempts to resolve a situation. 

noun
  • The state or process of simmering. 

  • Someone who plays a sim (a simulation game), particularly The Sims. 

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