hardship vs imperil

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. 

imperil

verb
  • To put into peril; to place in danger. 

  • To risk or hazard. 

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