unguent vs vaseline

unguent

noun
  • Any cream containing medicinal ingredients applied to the skin for therapeutic purposes. 

vaseline

noun
  • Any particular kind of petroleum jelly or of any similar lubricant. 

  • Petroleum jelly. 

verb
  • To lubricate with vaseline. 

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