bellflower vs tintinnabulum

bellflower

noun
  • A flower of one of these plants, which is shaped like a bell. 

  • Any flowering plants in the genus Campanula. 

  • Flowering plants in the genera, Campanulastrum, Codonopsis, or Platycodon, in the family Campanulaceae. 

  • Any flowering plant in genus Uvularia. 

tintinnabulum

noun
  • A small clinking bell, particularly (historical) a small bell used to call monks to certain tasks. 

  • A set of bells or metal plates used as a musical instrument or as a toy. 

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