rocket ship vs space shuttle

rocket ship

noun
  • A spacecraft propelled by a rocket engine. 

  • A ship armed with rockets. 

space shuttle

noun
  • Any vehicle capable of repeatedly travelling between destinations in outer space carrying people or cargo. 

  • Any vehicle capable of travelling repeatedly between the Earth's surface and outer space carrying people or cargo. 

How often have the words rocket ship and space shuttle occurred in a corpus of books? (source: Google Ngram Viewer )