disimprovement vs lowering

disimprovement

noun
  • Reduction from a better to a worse state. 

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

lowering

noun
  • The act of something being lowered. 

adj
  • Dark and menacing. 

  • Lurking, skulking, menacing. 

  • That lowers or frowns. 

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