shinleaf vs twinberry

shinleaf

noun
  • A perennial ericaceous herb (Pyrola elliptica) with a cluster of radical leaves and a raceme of greenish-white flowers. 

twinberry

noun
  • Its fruit, a bitter edible black berry containing several small seeds. 

  • A North American species of honeysuckle, Lonicera involucrata. 

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