speak out vs spout off

speak out

verb
  • To assert or promote one's opinion; to make one's thoughts known. 

spout off

verb
  • To speak in a particularly boastful or arrogant manner. 

  • To speak for a tedious or exasperating length of time. 

  • To utter something in a brash, unwelcome, or unpleasant manner. 

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