big talk vs hyperbole

big talk

noun
  • Statements which are boastful or exaggerated. 

  • Major topic of conversation; current gossip. 

hyperbole

noun
  • An instance or example of such overstatement. 

  • Deliberate or unintentional overstatement, particularly extreme overstatement. 

How often have the words big talk and hyperbole occurred in a corpus of books? (source: Google Ngram Viewer )