mild vs stern

mild

adj
  • Of only moderate severity; not strict. 

  • Not sharp or bitter; not strong in flavor. 

  • Not serious or dangerous. 

  • Moderately warm, especially less cold than expected. 

  • Gentle and not easily angered. 

  • Not overly felt or seriously intended. 

  • Acting gently and without causing harm. 

noun
  • A relatively low-gravity beer, often with a dark colour; mild ale 

stern

adj
  • Having a hardness and severity of nature or manner. 

  • Grim and forbidding in appearance. 

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

noun
  • A bird, the black tern. 

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

  • The hinder part of anything. 

  • The post of management or direction. 

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

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