dispersion vs wastage

dispersion

noun
  • The state of being dispersed; dispersedness. 

  • The removal of inflammation. 

  • The degree of scatter of data. 

  • The separation of visible light by refraction or diffraction. 

  • A process of dispersing. 

wastage

noun
  • Goods that are damaged, out of date, reduced, or generally unsaleable, which are destined to be thrown away and which are written off as a loss. 

  • The amount or proportion of something that is wasted or lost by deterioration or other natural process. 

  • The periodical turnover of personnel in an organisation by death, retirement or resignation, as perceived by those aspiring to promotion or appointment in the organisation. 

  • Anything lost by wear or waste. 

  • The act of abandoning animal carcasses or parts, usually illegal. 

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