chaff vs wastage

chaff

noun
  • Any excess or unwanted material, resource, or person; anything worthless. 

  • Light jesting talk; banter; raillery. 

  • Loose material, e.g. small strips of aluminum foil dropped from aircraft, intended to interfere with radar detection. 

  • Straw or hay cut up fine for the food of cattle. 

  • The inedible parts of a grain-producing plant. 

verb
  • To use light, idle language by way of fun or ridicule; to banter. 

  • To make fun of; to turn into ridicule by addressing in ironical or bantering language; to quiz. 

  • To cut up (straw or hay) for use as cattle feed. 

wastage

noun
  • Anything lost by wear or waste. 

  • 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. 

  • Goods that are damaged, out of date, reduced, or generally unsaleable, which are destined to be thrown away and which are written off as a loss.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 act of abandoning animal carcasses or parts, usually illegal. 

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