black caraway vs black cumin

black caraway

noun
  • A spice plant related to caraway and cumin, with dark seeds and an edible root, Bunium bulbocastanum 

  • A Middle-Eastern spice plant related to buttercups, Nigella sativa, with dark black, aromatic seeds. 

  • These seeds as spice. 

black cumin

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

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

  • A cultivated variety of cumin (Cuminum cyminum). 

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