hardship vs torture

hardship

verb
  • To treat (a person) badly; to subject to hardships. 

noun
  • Difficulty or trouble; hard times. 

  • A burden, a source of difficulty that could impose a barrier. 

torture

verb
  • To intentionally inflict severe pain or suffering on (someone). 

noun
  • The intentional causing of somebody's experiencing agony. 

  • The "suffering of the heart" imposed by one on another, as in personal relationships. 

  • (often as "absolute torture") Stage fright; severe embarrassment. 

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