abaft vs aft

abaft

adv
  • On the aft side; in the stern. 

prep
  • Behind; toward the stern relative to some other object or position; aft of. 

aft

adv
  • At, near, or towards the stern of a vessel (with the frame of reference within the vessel). 

noun
  • The stern portion of a vessel. 

adj
  • located at the back of a boat, ship, or airplane 

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