dearth vs overdose

dearth

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

  • Scarcity; a lack or short supply. 

overdose

verb
  • To dose to excess; to give an overdose, or too many doses, to. 

  • To dose excessively, to take an overdose. 

  • To indulge in something excessively. 

noun
  • An excessive and dangerous dose of a drug. 

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