gelatin vs vaseline

gelatin

noun
  • An edible jelly made from this material. 

  • A thin, translucent membrane used as a filter for photography or for theatrical lighting effects. 

  • A protein derived through partial hydrolysis of the collagen extracted from animal skin, bones, cartilage, ligaments, etc. 

vaseline

noun
  • Petroleum jelly. 

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

verb
  • To lubricate with vaseline. 

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