dearth vs oversupply

dearth

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

  • Scarcity; a lack or short supply. 

oversupply

verb
  • To supply more than is needed. 

noun
  • An excessive supply. 

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