diminution vs disimprovement

diminution

noun
  • A lessening, decrease or reduction. 

  • a compositional technique where the composer shortens the melody by shortening its note values. 

  • The act or process of making diminutive. 

disimprovement

noun
  • Reduction from a better to a worse state. 

  • attempt to make something better while ending up worse than before. 

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