ornament vs set off

ornament

verb
  • To add to. 

  • To decorate. 

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. 

set off

verb
  • To begin; to cause; to initiate. 

  • To put into an angry mood; to start (a person) ranting or sulking, etc. 

  • To leave; to begin a journey or trip. 

  • To enhance by emphasizing differences. 

  • To offset, to compensate for: to reduce the effect of, by having a contrary effect. 

  • To deface or soil the next sheet; said of the ink on a freshly printed sheet, when another sheet comes in contact with it before it has had time to dry. 

  • To cause to explode, let off. 

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