black alder vs possumhaw

black alder

noun

  • American winterberry, Ilex verticillata. 

  • Wood or other product of the tree. 

  • A tree (Alnus glutinosa), of many practical uses, growing in moist conditions in Europe. 

possumhaw

noun

  • American winterberry, Ilex verticillata. 

  • Deciduous Holly, Ilex decidua. 

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