rant vs sound off

rant

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

  • To speak or shout at length in uncontrollable anger. 

  • To dance rant steps. 

  • 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. 

sound off

verb
  • To hold forth about something in an opinionated manner. 

  • Command instructing a person to confirm that they are present or that some other objective has been met. 

  • Command instructing a person to speak up or acknowledge something. 

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