effervesce vs spurge

effervesce

verb
  • To emit small bubbles of dissolved gas; to froth or fizz. 

  • To escape from solution in a liquid in the form of bubbles. 

  • To show high spirits. 

spurge

verb
  • To emit foam; to froth; said of the emission of yeast from beer during fermentation. 

noun
  • Any plant of the genus Euphorbia, a diverse genus of over 2,000 species. 

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