abaft vs rearward

abaft

adv
  • On the aft side; in the stern. 

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

rearward

adv
  • Toward the back or rear of something. 

adj
  • Toward the back or rear of something. 

noun
  • The last troop; the rear of an army; a rear guard. 

  • The part that comes last or is situated in the rear; conclusion, wind-up. 

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