enrage vs vent one's spleen

enrage

verb
  • To fill with rage; to provoke to frenzy; to make furious. 

vent one's spleen

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

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