branching vs excrescence

branching

noun
  • A process of forming a branch. 

excrescence

noun
  • Something, usually abnormal, which grows out of something else. 

  • The epenthesis of a consonant, e.g., warmth as [ˈwɔrmpθ] (adding a [p] between [m] and [θ]), or -t (Etymology 2). 

  • A disfiguring or unwanted mark or adjunct. 

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