impair vs ornament

impair

verb
  • To weaken; to affect negatively; to have a diminishing effect on. 

ornament

noun
  • The articles used in church services. 

  • A characteristic that has a decorative function (typically in order to attract a mate) 

  • A musical flourish that is unnecessary to the overall melodic or harmonic line, but serves to decorate that line. 

  • An element of decoration; that which embellishes or adorns. 

  • A Christmas tree decoration. 

verb
  • To decorate. 

  • To add to. 

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