hawthorn vs thornbush

hawthorn

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

thornbush

noun
  • Any of many thorny or spiny shrubs and bushes. 

  • Hyponyms: bramble, briar 

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