outgrowth vs tumor

outgrowth

noun
  • Excessive growth. 

  • An appendage of an animal. 

  • A branch or offshoot of a plant. 

  • A byproduct or consequence of an action or event. 

tumor

noun
  • An abnormal growth; differential diagnosis includes abscess, metaplasia, and neoplasia. 

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