ptyalize vs slaver

ptyalize

verb
  • To salivate. 

  • To spit. 

slaver

verb
  • To drool saliva from the mouth; to slobber. 

  • To smear with saliva issuing from the mouth. 

  • To be besmeared with saliva. 

  • To fawn. 

noun
  • A ship used to transport slaves. 

  • Saliva running from the mouth; drool. 

  • A person engaged in the slave trade; a person who buys, sells, or owns slaves. 

  • A white slaver, who sells prostitutes into illegal 'sex slavery'. 

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