jacktar vs lascar

jacktar

noun
  • A sailor in the Royal Navy. 

lascar

noun
  • A sailor from India or Southeast Asia, especially as serving on a European ship. 

  • Any of various nymphalid butterflies of the Asian genera Pantoporia and Lasippa. 

  • A tent-pitcher; also a type of artilleryman. 

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