allheal vs kidney vetch

allheal

noun
  • Valeriana officinalis, a species in the valerian family. 

  • Stachys, a genus of plants in the mint family, heal-all, self-heal, woundwort, betony, lamb's ears, hedgenettle. 

  • Prunella vulgaris, a species in the mint family. 

kidney vetch

noun
  • Anthyllis vulneraria, a medical plant in the pea family 

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