ramification vs tree fork

ramification

noun
  • An arrangement of branches. 

  • A branching-out, the act or result of developing branches; specifically the divergence of the stem and limbs of a plant into smaller ones, or of similar developments in blood vessels, anatomical structures etc. 

  • An offshoot of a decision, fact etc.; a consequence or implication, especially one which complicates a situation. 

tree fork

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

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