blueberry vs harebell

blueberry

noun
  • The shrub of the above-mentioned berry. 

  • A dark blue colour. 

  • An edible round berry, belonging to the cowberry group (Vaccinium sect. Cyanococcus), with flared crowns at the end, that turns blue on ripening. 

verb
  • To gather or forage for blueberries. 

adj
  • Of a dark blue colour. 

harebell

noun
  • A perennial flowering plant, Campanula rotundifolia, native to the Northern Hemisphere, with blue, bell-like flowers. 

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