posset vs seethe

posset

verb
  • To vomit up curdled milk. 

  • To treat with possets; to pamper. 

noun
  • A beverage composed of hot milk curdled by some strong infusion, such as wine. 

  • A baby's vomit, comprising curdled milk. 

seethe

verb
  • To foam in an agitated manner, as if boiling. 

  • To be in an agitated or angry mental state, as if boiling. 

  • To buzz with activity. 

  • To boil vigorously. 

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