petroleum jelly vs vaseline

petroleum jelly

noun
  • A pale yellow semisolid mixture of hydrocarbons obtained from petroleum; used in lubricants and ointments. 

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 petroleum jelly and vaseline occurred in a corpus of books? (source: Google Ngram Viewer )