descending vs impairment

descending

noun
  • A descent. 

adj
  • Ordered such that each element is less than or equal to the previous element. 

  • Moving or sloping downwards. 

  • Becoming lower in pitch. 

  • Causing a sequence to follow a descending order. 

impairment

noun
  • A downward revaluation, a write-down. 

  • A deterioration or weakening 

  • The result of being impaired 

  • A disability or handicap 

  • an inefficient part or factor. 

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