fulminate vs vent one's spleen

fulminate

verb
  • To make a verbal attack. 

  • To issue as a denunciation. 

  • To thunder or make a loud noise. 

noun
  • Any salt or ester of fulminic acid, mostly explosive. 

vent one's spleen

verb
  • To openly express pent-up anger, often on an unrelated matter or person. 

How often have the words fulminate and vent one's spleen occurred in a corpus of books? (source: Google Ngram Viewer )