black raspberry vs thimbleberry

black raspberry

noun
  • The fruit of any of these species. 

  • A plant belonging to either of two closely related species, Rubus leucodermis or Rubus occidentalis, both native to North America. 

  • Rubus coreanus, native to Korea, Japan, and China 

thimbleberry

noun
  • The fruit of the above plant. 

  • Rubus parviflorus, a species of Rubus, native to western and northern North America, from Alaska east to Ontario and Minnesota, and south to northern Mexico. 

  • The black raspberry, Rubus occidentalis. 

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