greaser vs rockstar

greaser

noun
  • A rocker or metalhead, especially one who listens to 1950s rock and roll or 1980s thrash metal. 

  • A mechanic. 

  • Someone or something that greases (applies grease). 

  • A biker, a tough. 

  • A Latin American, especially a Mexican. 

  • An Italian. 

  • A Greek. 

rockstar

noun
  • A member of a rock band, or a solo artist in the genre, especially one with celebrity status. 

  • Any animal, plant, or other thing that is renowned amongst others of its type. 

  • A person who is renowned or revered in his or her field of accomplishment. 

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