appendage vs outgrowth

appendage

noun
  • An external body part that projects from the body. 

  • A part that is joined to something larger. 

  • A natural prolongation or projection from a part of any organism. 

outgrowth

noun
  • An appendage of an animal. 

  • A branch or offshoot of a plant. 

  • Excessive growth. 

  • A byproduct or consequence of an action or event. 

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