divarication vs tree fork

divarication

noun
  • The growth habit of some low-growing shrubs; with wide angles where they diverge, the branches may interlace. 

  • The point at which branching occurs. 

  • A divergence of opinion. 

tree fork

noun
  • A bifurcation in the trunk of a tree giving rise to two roughly equal diameter branches. 

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