blackberry vs hawthorn

blackberry

noun
  • A fruit-bearing shrub of the aggregate species Rubus fruticosus and some hybrids. 

  • The soft fruit borne by this shrub, formed of a black (when ripe) cluster of drupelets. 

  • The blackcurrant. 

verb
  • To gather or forage for blackberries. 

hawthorn

noun
  • Any of various shrubs and small trees of the genus Crataegus having small, apple-like fruits and thorny branches 

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