coralberry vs skokeberry

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. 

skokeberry

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

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