bearberry vs winterberry

bearberry

noun
  • Arctostaphylos uva-ursi, the common bearberry. 

  • Any of three dwarf shrubs of the genus Arctostaphylos, which principally grow in arctic and subarctic regions and bear edible berries. 

  • Arbutus menziesii. 

winterberry

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

  • The fruit of this plant. 

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