depreciation vs spoilage

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. 

spoilage

noun
  • The part of something that has spoiled. 

  • The process of spoiling. 

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