depreciation vs wear and tear

depreciation

noun
  • The state of being depreciated; disparagement. 

  • The decline in value of assets. 

  • The measurement of the decline in value of assets. Not to be confused with impairment, which is the measurement of the unplanned, extraordinary decline in value of assets. 

wear and tear

noun
  • Damage or depreciation resulting from ordinary use (normally as something excluded from a guarantee or warranty of quality, or as justifying a write-down in a set of accounts). 

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