passenger ship vs watercraft

passenger ship

noun
  • A ship whose primary function is to carry passengers. 

watercraft

noun
  • Any vessel with implements designed to move it in arbitrary direction through one or various bodies of water – a boat, ship, sea scooter, or similar vehicle. 

  • Skill in boating, swimming, or other water-related sports. 

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