centaury vs feverfew

centaury

noun
  • Schenkia, a genus in Gentianaceae, formerly included in Centaurium, with species commonly called centaury 

  • Centaurium, sensu stricto 

  • Centaurea, a genus in the Asteraceae containing species sometimes called centaury 

  • Gyrandra, a genus in Gentianaceae, formerly included in Centaurium, with species commonly called centaury 

  • Cheirolophus crassifolius, a species in the Asteraceae commonly known as Maltese centaury 

  • Zeltnera, a New World genus in Gentianaceae, formerly included in Centaurium, with species commonly called centaury 

  • Sabatia, a New World genus in the Gentianaceae containing species sometimes called centaury 

feverfew

noun
  • A European aromatic perennial herb, Tanacetum parthenium (or Chrysanthemum parthenium or Pyrethrum parthenium), having daisy-like flowers; valued as a traditional medicine, especially for headaches. 

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