froth vs saliva

froth

noun
  • foam 

  • Thousands of African children die each day: why do the newspapers continue to discuss unnecessary showbiz froth? 

  • Highly speculative investment. 

  • The idle rich; 

  • unimportant or insubstantial talk, events, or actions; drivel 

verb
  • To spit, vent, or eject, as froth. 

  • To cover with froth. 

  • (of a liquid) To bubble. 

  • To create froth in (a liquid). 

  • (literally) To spew saliva as froth; (figuratively) to rage, vent one's anger. 

saliva

noun
  • A clear, slightly alkaline liquid secreted into the mouth by the salivary glands and mucous glands, consisting of water, mucin, protein, and enzymes. It moistens the mouth, lubricates ingested food, and begins the breakdown of starches. 

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