black alder vs skokeberry

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. 

skokeberry

noun
  • A pokeberry; a pokeweed (the plant Phytolacca americana or its dark red or purple fruit). 

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