need vs thirst

need

verb
  • To want strongly; to feel that one must have something. 

  • To be obliged or required (to do something). 

  • To be required; to be necessary. 

  • To have an absolute requirement for. 

noun
  • Lack of means of subsistence; poverty; indigence; destitution. 

  • A requirement for something; something needed. 

thirst

verb
  • To desire vehemently. 

  • To be thirsty. 

noun
  • Sexual lust. 

  • A want and eager desire (for something); a craving or longing. 

  • A sensation of dryness in the throat associated with a craving for liquids, produced by deprivation of drink, or by some other cause (such as fear, excitement, etc.) which stops the secretion of the pharyngeal mucous membrane. 

  • The condition producing the sensation of thirst. 

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