austerity vs frugality

austerity

noun
  • Severity of manners or life; extreme rigor or strictness; harsh discipline. 

  • A policy of deficit-cutting, which by definition requires lower spending, higher taxes, or both. 

  • Freedom from adornment; plainness; severe simplicity. 

frugality

noun
  • A sparing use; sparingness. 

  • The quality of being frugal; prudent economy; thrift. 

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