emergence vs outgrowth

emergence

noun
  • The act of rising out of a fluid, or coming forth from envelopment or concealment, or of rising into view; sudden uprising or appearance. 

  • In particular: the arising of emergent structure in complex systems. 

outgrowth

noun
  • A byproduct or consequence of an action or event. 

  • An appendage of an animal. 

  • A branch or offshoot of a plant. 

  • Excessive growth. 

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