blarney vs hot air

blarney

noun
  • Mindless chatter. 

  • Ability to talk constantly and fluently. 

  • Persuasive flattery or kind speech; smooth, wheedling talk. 

verb
  • To beguile with flattery. 

hot air

noun
  • Empty, confused, or exaggerated talk lacking meaning or substance; bluster. 

  • Air that has been heated, especially so as to function as the lifting agent of a hot-air balloon. 

How often have the words blarney and hot air occurred in a corpus of books? (source: Google Ngram Viewer )