harm vs impairment

harm

noun
  • detriment; misfortune. 

  • physical injury; hurt; damage 

  • That which causes injury, damage, or loss. 

  • emotional or figurative hurt 

verb
  • To cause injury to another; to hurt; to cause damage to something. 

impairment

noun
  • A deterioration or weakening 

  • The result of being impaired 

  • A downward revaluation, a write-down. 

  • A disability or handicap 

  • an inefficient part or factor. 

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