collier vs seawoman

collier

noun
  • A sailor on such a vessel. 

  • A non-traveller. 

  • A person in the business or occupation of producing (digging or mining) coal or making charcoal or in its transporting or commerce. 

  • A vessel carrying a bulk cargo of coal. 

seawoman

noun
  • A female sailor; a woman who serves on a ship at sea. 

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