American winterberry vs coralberry

American winterberry

noun
  • Ilex verticillata, a species of holly native to eastern North America in the United States and southeast Canada, from Newfoundland west to Ontario and Minnesota, and south to Alabama. 

coralberry

noun
  • American winterberry, Ilex verticillata. 

  • Symphoricarpos orbiculatus, of eastern North America. 

  • Ardisia crenata of east Asia. 

  • A species of bromeliad, Aechmea fulgens, of Brazil, and which is often used as an ornamental plant. 

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