backside vs stern

backside

noun
  • The reverse or opposite of anything. 

  • Used other than figuratively or idiomatically: see back, side. 

  • The back side of an estate: the backyard and outbuildings behind a main house, especially (UK dialect, euphemistic) an outhouse. 

  • A person's buttocks. 

adj
  • Used other than figuratively or idiomatically: see back, side. 

  • Approaching an obstacle backward 

stern

noun
  • The hinder part of anything. 

  • A bird, the black tern. 

  • The tail of an animal; now used only of the tail of a dog. 

  • The post of management or direction. 

  • The rear part or after end of a ship or vessel. 

adj
  • Grim and forbidding in appearance. 

  • Having a hardness and severity of nature or manner. 

verb
  • To propel or move backward or stern-first in the water. 

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