drool vs water at the mouth

drool

noun
  • Stupid talk. 

  • Saliva trickling from the mouth. 

verb
  • To talk nonsense; drivel. 

  • To secrete any substance in a similar way. 

  • To secrete saliva, especially in anticipation of food. 

  • To react to something with uncontrollable desire. 

water at the mouth

How often have the words drool and water at the mouth occurred in a corpus of books? (source: Google Ngram Viewer )