thirst vs urge to merge

thirst

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. 

verb
  • To be thirsty. 

  • To desire vehemently. 

urge to merge

noun
  • A strong desire to form intense emotional connections, stereotypically associated with lesbians. 

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