alder vs coralberry

alder

noun
  • Any of several trees or shrubs of the genus Alnus, belonging to the birch family. 

  • An alderman or alderwoman. 

coralberry

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

  • Symphoricarpos orbiculatus, of eastern North America. 

  • American winterberry, Ilex verticillata. 

  • Ardisia crenata of east Asia. 

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