dearth vs dry spell

dearth

noun
  • Scarcity; a lack or short supply. 

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

dry spell

noun
  • A period or time where there is little activity, productivity, low income etc. 

  • A drawn-out period where the weather has been dry, for an abnormally long time; shorter and not as severe as a drought. 

  • A period of time without sexual intercourse. 

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