astern vs mizzen

astern

adj
  • Behind a vessel; having a bearing of 180 degrees from ahead. 

adv
  • Behind (a vessel); in the rear. 

  • In the direction of the stern; backward (motion); to the rear. 

mizzen

adj
  • Hindmost; nearest the stern. 

noun
  • A fore-and-aft sail set on a mizzenmast. 

  • Mizzenmast. 

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