black cumin vs fennelflower

black cumin

noun
  • A spice plant with aromatic seeds (Nigella sativa). 

  • A cultivated variety of cumin (Cuminum cyminum). 

  • A spice plant related to cumin with dark seeds and an edible root (Bunium bulbocastanum). 

fennelflower

noun
  • Nigella sativa, an annual flowering plant native to south and southwest Asia. 

  • Nigella damascena, ragged lady 

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