sing one's own praises vs vaunt

sing one's own praises

vaunt

verb
  • To speak boastfully about. 

  • To boast of; to make a vain display of; to display with ostentation. 

  • To speak boastfully. 

noun
  • A boast; an instance of vaunting. 

How often have the words sing one's own praises and vaunt occurred in a corpus of books? (source: Google Ngram Viewer )