alder vs winterberry

alder

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

  • An alderman or alderwoman. 

winterberry

noun
  • The fruit of this plant. 

  • A species of holly native to the United States and Canada and producing red berries, Ilex verticillata. 

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