dearth vs shortfall

dearth

noun
  • Scarcity; a lack or short supply. 

  • A period or condition when food is rare and hence expensive; famine. 

shortfall

noun
  • An instance of not meeting a quota, debt, or monthly payment on a debt or other obligation, or of having an insufficient amount to cover such obligations. 

  • The amount by which a quota, debt, or monthly payment on a debt or other obligation is missed; the difference between the actual quota or debt and the lesser amount available to pay such obligations. 

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