hedging vs thornbush

hedging

noun
  • Any plant used to form a hedge. 

  • The act of one who hedges (in various senses). 

  • The use of intentionally ambiguous or noncommittal statements. 

thornbush

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

  • Hyponyms: bramble, briar 

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