rant vs vent one's spleen

rant

verb
  • To speak or shout at length in uncontrollable anger. 

  • To dance rant steps. 

  • To disseminate one's own opinions in a - typically - one-sided, strong manner. 

  • To criticize by ranting. 

noun
  • A wild, emotional, and sometimes incoherent articulation. 

  • A criticism done by ranting. 

  • A type of dance step usually performed in clogs, and particularly (but not exclusively) associated with the English North West Morris tradition. The rant step consists of alternately bringing one foot across and in front of the other and striking the ground, with the other foot making a little hop. 

vent one's spleen

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

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