irritate vs vent one's spleen

irritate

verb
  • To provoke impatience, anger, or displeasure in. 

  • To cause or induce displeasure or irritation. 

  • To induce pain in (all or part of a body or organism). 

vent one's spleen

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

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