bellflower vs bellwort

bellflower

noun
  • Any flowering plants in the genus Campanula. 

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

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

  • Any flowering plant in genus Uvularia. 

bellwort

noun
  • Any of various plants in the Campanulaceae family. 

  • Any of several perennial plants, of the genus Uvularia, that have yellow, bell-shaped flowers. 

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