outgrowth vs tree fork

outgrowth

noun
  • A branch or offshoot of a plant. 

  • An appendage of an animal. 

  • Excessive growth. 

  • A byproduct or consequence of an action or event. 

tree fork

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

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