Dart vs jacktar

Dart

noun
  • An officer trained at Britannia Royal Naval College, Dartmouth, England. 

name
  • A town in Ontario, Canada 

  • A river in Devon, England, which flows from Dartmoor to the English Channel at Dartmouth. 

  • A surname from Middle English. 

jacktar

noun
  • A sailor in the Royal Navy. 

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